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Robert Craig: Judicial Review of Advice to Prorogue Parliament

In a recent Times article, Lord Pannick QC – leading Counsel in the Miller litigation – argues that if a Prime Minister were to advise HMQ to prorogue parliament to achieve a No Deal exit, an application could be made to the courts to determine the lawfulness of such advice. Sir John Major said on the Today programme on 10 July that he would personally bring a judicial review of any decision by the Prime Minister to advise prorogation.

After briefly considering issues of timing and justiciability, Lord Pannick makes three main arguments as to why, in his view, advice to prorogue parliament to achieve No Deal would be ruled unlawful by the courts. First, he claims that proroguing parliament would contradict parliamentary sovereignty. Secondly he claims the urgency of the situation would make prorogation unlawful. Thirdly, he argues that such advice would be ‘seeking to evade parliament because it has previously made clear its wish to prevent a no-deal Brexit’.

While Lord Pannick’s argument is characteristically attractively presented, there are some significant difficulties with it. Of course, it must be borne in mind that a brief 800 word article in a newspaper cannot do justice to the full argument.

Space precludes detailed consideration of issues of timing but suffice to say that Miller was incredibly expedited, including leapfrogging the Court of Appeal, but it still took six months.

A caveat on the potential use of prerogatives in the Brexit context

I have previously defended the theoretical possibility of the use of Royal Assent and Queen’s Consent in some extreme circumstances if there were unprecedented moves by a shadow executive undermining the procedures of the House of Commons. I have ultimately justified these responses because the remedy of a vote of no confidence remains available.

My view on prorogation is considerably more conflicted, precisely because any overtly political prorogation to avoid a vote of no confidence contradicts what I view as the central principle of the political constitution which is the doctrine of confidence. Parliament represents a dialectical relationship between the two balancing forces of executive and legislature, both of which we choose in our bifurcated vote at general elections. When we vote in the UK, we choose a local MP, but in reality we also vote on a manifesto and on a slate of those seeking executive office.


The most serious problem facing any potential litigation relates to justiciability. In his article, Lord Pannick lightly touches on case law relating to passports, ex gratia payments and other successful applications to the court for review of the exercise of prerogative power. Unfortunately, these examples fall on one side of a clear red line for the courts in terms of the kinds of prerogative that they are normally prepared even to consider.

In GCHQ, Lord Roskill famously listed a series of prerogatives that he held would remain outside the court’s purview even after the test set out by the court for judicial review transitioned from the source of the power to the subject matter of that power. Technically the list is obiter dicta, of course.

The Roskill list includes ‘the making of treaties, the defence of the realm, the prerogative of mercy, the grant of honours, the dissolution of Parliament and the appointment of ministers’ (p418). The prorogation of parliament falls squarely within the category of prerogatives set out in this list. This is particularly true in this case because Lord Roskill states that it is prerogatives ‘relating to’ any of the above list that are in this category – this obviously includes prorogation which is historically connected to dissolution.

It is also worth noting that in the later case of Everett, a ‘high policy’ test for the prerogatives on the list was instituted, and that test has never been doubted. Indeed, in Abbasi, Lord Phillips MR expressly endorsed the ‘high policy’ test in considering the actions of the government under the foreign affairs prerogative.

Lord Phillips also used the phrase ‘forbidden areas including decisions affecting foreign policy’ ([106]) which also underscores the unlikelihood of any judicial intervention in matters as controversial and politically explosive as a political decision to prorogue parliament to achieve a No Deal exit. It is perhaps also worth mentioning that, in this particular case, a decision to prorogue would have direct and dramatic effects on foreign policy.

It is suggested therefore that prorogation would therefore fall well within the ‘high policy’ test given the intense political controversy that would surround such an action. It is therefore extremely challenging to see how such advice could be justiciable on any orthodox reading of long established case law. This rule arguably rests, in large part, on a point blank refusal to be drawn into controversial political matters. This deeply wise judicial instinct is strongly to be commended.

Argument from Miller?

It might be thought that the justiciability argument must be tempered by the fact that in Miller itself, a high policy prerogative (treaty power) was considered to be justiciable – indeed the justiciability argument was not even raised at the Supreme Court stage having been resoundingly rejected by the High Court. This would be to miss a crucial distinction between Miller and a potential prorogation. The courts have never held that a prerogative is non-justiciable when it is used in a way that intersects with a statute. In those circumstances, a completely different test is applied.

If statute overlaps with the prerogative, it goes into abeyance. Where a statute does not overlap, the test is whether the exercise of the relevant prerogative would frustrate the intention of parliament in any Act (Miller [51]). In such situations, the court is not concerned in any way with whether the nature of the prerogative concerns ‘high policy’. This is for the simple reason that statute trumps prerogative and it is the duty of the courts to see that the will of parliament as expressed in statute prevails. That is why the justiciability of the treaty prerogative was not an issue in Miller, despite it being on Roskill’s list.

Parliamentary Sovereignty means the will of parliament as expressed in statute

It is trite law that the will of parliament can only be understood through Acts of Parliament as a matter of law. Mere motions will not suffice. If they had, the motion in the House of Commons in December 2016, calling for notification under Article 50 to be sent, would have disposed of the Miller litigation.

Lord Pannick’s appeal, therefore, to the generic idea of ‘parliamentary sovereignty’ must therefore be approached with some caution. Parliamentary sovereignty means nothing more, and nothing less, than that each and every Act of Parliament that is on the Parliamentary Roll is supreme over any other law or legal power. In other words, whatever the Crown-in-Parliament formally enacts is binding law, save that Parliament cannot bind its successors.

It follows that if Lord Pannick could identify a particular provision of a statute that would be frustrated then the objections based on justiciability would immediately dissipate. Unfortunately, it is difficult to identify any such statutory provision. Instead, the much more nebulous language of ‘evading parliament’ is deployed. This leaves his argument looking somewhat thin.

The problem is that isolating a sound legal argument from ’evading parliament’ is difficult, whatever the constitutional and political arguments. This is not least because there is no particular statute to which reference could be made. Evading political scrutiny and debate is not a legal argument.

It seems unlikely that the courts would declare something unlawful based on it frustrating a provision of a non-existent Act that the courts would be predicting parliament might pass at some unknown time in the future. That would be to extend the principle in Fire Brigades Union by some distance, to put it mildly.

Lord Pannick goes on to claim that one aspect of the claim would be that, in his view, parliament has ‘made clear its wish to prevent a no-deal Brexit’. This particular claim is hard to follow. Nowhere in EUNoWA, EUWA or elsewhere has parliament made clear in legislation that in the event of there being no deal agreed with the EU27, the government is legally required to take steps to prevent the UK exiting the EU on  that basis. It is true that a number of motions of the House of Commons have expressed that sentiment or similar but that is entirely another matter and, strictly speaking, irrelevant as a matter of law.

It could be argued that the silence in relevant statutes on any legal steps to be taken in the extensive legislation that has been passed since the referendum simply reflects the fact that few people expected that No Deal could actually happen. This is a reasonable stance. Nevertheless, it remains the case that the Article 50 process is in fact inexorable and (leaving aside revocation) remains outside the direct control of parliament, particularly if, say, the EU27 decided not to grant another extension.

It is also the case that there are no provisions altering the legal default outcome (for example by mandating a revocation) in the event that there is no agreement with the EU27 regarding the orderly withdrawal of the UK from the EU. The only possible exception might be the Cooper-Letwin Act which mandated the Prime Minister to seek an extension from the EU27 (I am grateful to Gavin Phillipson for suggesting this point in conversation).

It might be argued that this represents evidence that the will of parliament is that a delay is preferable to exiting without a deal. The problem with this argument is that Cooper-Letwin was very specific in terms of how and when it applied and its provisions are now spent. Really, the Act needed to have made further provision for the legal consequences in the event of No Deal. Attempting to read anything more into that Act seems implausible.

However alluring is the argument that the courts could step in, it is difficult to see how the exercise of the prerogative of prorogation in this case could be said to conflict with any particular provision of any statute.

Breaking new legal ground 

Given the strength of the judicial dicta against Lord Pannick’s position, it would require an innovative and bold approach by the judiciary for any case to succeed. The courts would have to construct a novel rule that the mere possibility of Parliament wishing to pass some future legislation means that a purely political prorogation would be unlawful. This possibility cannot be ruled out but it would drive a coach and horses through long standing case law on justiciability, with unknown future effects.

Political controversy

The idea of the courts ensuring that parliament can do its core job of considering Brexit throughout the Autumn is undeniably attractive. It is suggested, however, that the courts would be rightly reluctant to intervene in such an intensely controversial political question, especially without the protection of an existing Act of Parliament that intersects directly with the relevant prerogative. To do so would be to draw the judiciary into the centre of a political firestorm. However politically controversial a prorogation might be, judicial intervention would only make the situation worse. Two wrongs do not make a right.

In those circumstances, reliance must be placed on the relevant parties being persuaded that advising HMQ to prorogue would be deeply politically and constitutionally inappropriate, rather than illegal or ultra vires.


This post has sought to address the possibility of litigation to challenge the lawfulness of using the prorogation prerogative politically. The proposal suffers from serious flaws, not least lack of time. It has been argued that the use of the prerogative of prorogation is not justiciable as ‘high policy’ in a ‘forbidden area’.

It has also been suggested that the argument that parliamentary sovereignty would be frustrated by prorogation is flawed because there is no particular statutory provision that would be frustrated by prorogation.

Furthermore, it seems highly unlikely that the courts would be drawn into what remains, in a political constitution, a matter of purest politics that should be dealt with by elected politicians, when parliament reconvenes, or at the ballot box.

The author would like to thank Richard Ekins, Sir Stephen Laws QC, Gavin Phillipson, Meg Russell, Catherine Haddon, Tom Poole and Colm O’Cinneide for their helpful comments and suggestions. The usual disclaimer applies.

Robert Craig is an AHRC doctoral candidate and part time tutor in law at Durham Law School, Durham University and at LSE, Department of Law.

(Suggested citation: R. Craig, ‘Judicial Review of Advice to Prorogue Parliament’, U.K. Const. L. Blog (12th Jul. 2019) (available at

21 comments on “Robert Craig: Judicial Review of Advice to Prorogue Parliament

  1. rhysdelahay
    July 12, 2019

    I can not read it all because there is no excuse for the government bto break the law and perversion and furthermore to cover-up evidence for self promotion and neglect to the Public as a whole.

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  2. rhysdelahay
    July 12, 2019

    The Prime Minister TM never asked permission she did try to break the law, you know the procedural rule, did she ask permission from EU?

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  3. Paul W
    July 12, 2019

    Whilst I take the point that Parliamentary sovereignty means sovereignty by way of Acts of Parliament, there is something peculiar with the system if the Executive has the power of prorogation to prevent the Houses of Parliament passing those very Acts of Parliament. Looks like a discretionary sort of sovereignty.

    The solution lies with Parliament itself, which should now pass a one line Act that Parliament can only be prorogued by the Crown by way of an Order in Council which may be negated by a resolution of the House of Commons.

    • Robert Craig
      July 15, 2019

      This is an entirely reasonable and sensible suggestion in my view. I take no position on questions of reform at this point myself, seeking only to set out the legal and constitutional position as I see it.

  4. Dr F J W Taylor
    July 12, 2019

    If it were considered that the exercise of the Royal Prerogative by HMQ herself “La Reine ne veult” (last exercised by Queen Anne) were considered to be in abeyance rather than to be obsolete, what would prevent HMQ exercising it in the event of an attempt to prorogue Parliaments? What limits may be placed on HMQ? Presumably there could be no question of judicial review of such an action by HMQ? Also, that HMQ is “above politics” is merely a convention, which can be set aside?

    (Please note that I am a lay observer and not a constitutional lawyer.)

    • Robert Craig
      July 15, 2019

      The prerogative of prorogation is not in abeyance and still rests in the hands of HMQ. Litigation would focus on the *advice* given to HMQ not the legal power itself.

  5. Tony
    July 12, 2019

    Parliament has the power to dismiss the executive through a no confidence motion. Moreover, it has the power to legislate to change executive powers and/or completely abolish them. This means that Parliament and the executive do not “balance” each other because they are not co-equal: the executive exists because Parliament wishes it exist. This is why Parliament is the senior partner in constitutional terms. Therefore, this statement is incorrect: “Parliament represents a dialectical relationship between the two balancing forces of executive and legislature”.

    Regarding prorogation, it is very important to note that has been regulated by Parliament in the past. Specifically, the “Frequent Parliaments” clause of the Bill of Rights 1688 states:

    “And that for Redresse of all Grievances and for the amending strengthening and preserveing of the Lawes Parlyaments ought to be held frequently.”

    The prerogative power of prorogation is therefore not absolute and this means it is capable of misuse. If Parliament were to be prorogued at a critical period leading up to the dis-application of the EU treaties this would engage this clause because:

    [1] Parliament would not be capable of redressing legitimate grievances via legislation (or otherwise) and,

    [2] Parliament would not be capable of preserving laws (specifically EU laws derived from the EU treaties) if it wished to do so.

    It therefore follows that any attempt to exercise the power to prorogue Parliament in these circumstances would be fully justiciable and reviewable by the courts and that they would be able to nullify it.

    • Robert Craig
      July 15, 2019

      When I said “balancing forces” I did not say the balance was *equal*. It isnt, and it can be changed, as happened with the FtPA. I therefore disagree that my claim is “wrong” as you suggest.Your point [1] is interesting and may be the subject of litigation shortly. I stand by my arguments in the post as to why I think the judiciary may be reluctant to countenance that litigation.

  6. Roger
    July 12, 2019

    “The idea of the courts ensuring that parliament can do its core job of considering Brexit throughout the Autumn is undeniably attractive.”

    Might the courts not think that 3 years plus already taken to consider Brexit is not time enough and that it was time the matter was dispatched, even if a controversial mechanism was employed indirectly?

  7. Mark Johnston
    July 12, 2019

    Error in para 1:
    “argues that if a Prime Minister were to advise HMQ to prorogue parliament to AVOID a No Deal exit”
    should be the reverse i.e. to ALLOW a ‘no-deal’ scenario.

  8. Mark Johnston
    July 12, 2019

    Prorogation typically occurs yearly whereas dissolution typically occurs every five years. Thus quite a stretch to say “this obviously includes prorogation which is historically connected to dissolution.”

    • Robert Craig
      July 15, 2019

      This is a good point. It might be better to say that dissolution is connected to prorogation rather than the other way round. I dont think anything substantial turns on this point. Prorogation is clearly within the Roskill category in my opinion.

  9. Mark Johnston
    July 12, 2019

    Moreover, Section 13(1) of the 2018 EU Withdrawal Act sets conditions for the ratification of the EU Withdrawal treaty, so proroguing Parliament would have the effect of preventing it from conducting its statutory requirements.

    • Robert Craig
      July 15, 2019

      Those requirements only kick in if a motion is put forward by a minister. If no minister wishes to do so (because there is no deal), I struggle to see the relevance of s13 EUWA. But its an interesting point.

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  11. In my view this argument misses the central point of Miller. In that case the majority in the UKSC decided that royal prerogative could not be used to affect significant constitutional changes, exit from the EU being a significant one, without explicit statutory authorisation. Prorogation of Parliament with the effect of exit from the EU would be an exercise of prerogative which would affect significant constitutional change. It is true that Parliament has authorised the Art 50 notification and the consequent legal default of no deal on exit day. However, as the Cooper Act indicates, Parliament has sought to control the legal default and exit day. So, in the event of the exercise of the prerogative by the next Prime Minister to prorogue Parliament, it is arguable that the Miller reasoning would kick in: Parliament ought to be given the possibility to control the legal default and exit day. Otherwise, the prerogative would affect a major constitutional change without explicit statutory authorisation and, actually, with some statutory evidence that Parliament wishes to control the legal default and exit day.

    • Robert Craig
      July 15, 2019

      You claim that Miller decided that RP cannot be used to affect significant constitutional change. That argument was in fact obiter dicta. The ratio was that RP could not be used in a way that frustrated any Act of Parliament (at [51]). When applied to the facts in Miller, it followed that RP could not be used to trigger the Article 50 process because that would frustrate the ECA and the EPEA. I am not, therefore, entirely persuaded that confusion over the central point of Miller rests with me, at least on this occasion.

      You concede that Parliament has indeed legislated to authorise the UK to leave the EU as the “legal default”,

      You are mistaken, however, in claiming that *Parliament* has sought to control the legal default and exit day. It has not. It has *conferred* the power to change exit day onto the executive, who can do so via a statutory instrument. It is a common mistake to conflate the legislature and executive, and in this case it fatally undermines your argument.

      The same error underpins your claim that the “Miller reasoning” can be summarised as the courts insisting that “Parliament ought to be given the possibility to control legal default and exit day”.

      The courts said no such thing. They merely said that the executive could not use the prerogative to trigger the A50 process. They said nothing about what parliament should do subsequently, or whether the government should propose a bill to confer the power to notify onto the PM etc etc. Those were all matters they expressly refused to discuss. All they dealt with was whether the RP could be used to trigger the A50 process. It could not.

      It is you, therefore, who “misses the central point of Miller”, in thinking that the case could be grounds for the claim that parliament should be “given the possibility to control the legal default and exit day”. A claim that advice to prorogue could be unlawful has nothing to do with Miller unless there is a specific Act of Parliament that would be frustrated by such an exercise of prerogative power.

      I may have misunderstood, but it seems to be your view that Miller is authority for the proposition that the courts have *held* that Parliament must be involved and in control of the Brexit process. This view is one that many non-experts and non-lawyers keep repeating, even though it is wrong. You are not a non-expert or non-lawyer so it is a bit disappointing to get the strong impression that you agree with that canard. But, as I say, I may have misunderstood your position.

      It is also arguably mistaken to claim that prorogation would “affect [sic] significant constitutional change”. On the contrary, that change has already happened through EUNoWA and EUWA as you earlier concede. It is equally arguable that the major change, at this stage, would be *not* to leave, as I argued (with Richard Ekins and Sir Stephen Laws) in a recent Policy Exchange paper “Lost in Transition”.

    • Roger
      July 15, 2019

      No one can know that is what Parliament might or might not decide to do.

      That is the point of prorogation if done: it will not be a valid argument to anticipate what Parliament might have done, or what it might have been prevented from doing.

      Also by prorogued Parliament it prevents the possibility of constitutional change, it wouldn’t actually change anything constitutional. That has already been done and properly enacted.

  12. It would be interesting to hear your view, Robert, on Sam Fowles’ argument in another UKCL blog that the courts could consider an application for review framed in terms of the scope of the “proroguing prerogative”. If so, they could then rule that it was beyond the scope of the prerogative to use it for a purpose of avoiding Parliamentary scrutiny of Executive action. If you consider that is a tenable argument, do you consider that the Government could justify prorogation on some other basis, e.g. the need for a new legislative programme?, and, if the Government were to cite that as the (main) justification, would a court still consider itself able to intervene?

  13. Malcolm Ramsay
    July 15, 2019

    “It is suggested, however, that the courts would be rightly reluctant to intervene in such an intensely controversial political question”

    I imagine the courts would much prefer to hear the arguments before the country goes through the turmoil of withdrawal, than to risk a successful retrospective challenge to the constitutional validity of the process.

    I find it bizarre, though, that there is so much debate around peripheral issues, like prorogation, when the actual decision to leave has so obviously been made without the care and attention our constitution requires. When the referendum clearly showed the country to be in two minds on the subject, how can the government’s interpretation of it as a clear instruction to leave be a lawful basis for an administrative decision? And, given the possibility that many leave voters were primarily just voting against the status quo, were the government not grossly negligent in failing to explore whether other, less disruptive courses of action might have satisfied the public’s hunger for change?

  14. Pingback: Brexit Highlights 8 – 14 July 2019 | Middle Temple Library Blog

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