"If the Queen’s Speech is amended, the Prime Minister must resign"

Were the EU referendum amendment passed, Cameron would either have to resign or abandon centuries of parliamentary convention.

If the prospect of government MPs tabling an amendment to the Queen's Speech wasn't unusual enough (it hasn't happened since 1946), it now appears that David Cameron may be prepared to take the extraordinary step of supporting them. The Sun reports that Cameron is ready to vote in favour of the Conservative amendment, which "Respectfully regrets that an EU referendum bill was not included in the gracious speech". A No. 10 source tells the paper: "The PM is determined to make as many people as possible aware how keen he is to hold this referendum.

"This amendment backs up his policy, which is a Conservative Party policy, so why shouldn’t he vote for it too?"

In other words, the Prime Minister may be about to rebel against his own government. That really would put us in uncharted territory. As the Parliament website states, by convention, "If the Queen’s Speech is amended, the Prime Minister must resign." The last time an amendment was successful was in 1924 when Labour tabled a motion of no confidence in Stanley Baldwin's Conservative government. After the motion was passed by 328 votes to 251, Baldwin resigned as prime minister and Ramsay MacDonald formed the first Labour government. 

With Labour and the Liberal Democrats set to vote against the amendment (they have 314 MPs to the Tories' 305), there's almost no chance of it passing (although at least two Labour MPs, John Cryer and Kelvin Hopkins, have signed the amendment and there's always the option of abstaining...). But were the Tory rebels successful, it is clear that Cameron would either have to resign or abandon centuries of parliamentary convention. 

Update: It look as if there may be an escape route for Cameron. I've just spoken to the Commons Information Office which has informed me that as a result of the Fixed-term Parliaments Act, a successful amendment to the Queen's Speech is no longer regarded as a vote of no confidence in the government. This is because, for the first time, the bill offered a legal definition of a no confidence vote - a motion stating that "That this House has no confidence in Her Majesty’s Government." - meaning that defeats on matters such as the Queen's Speech or the Budget are no longer regarded as votes of no confidence in the government. Prior to the act, as the Information Office put it, "it was a motion of no confidence if everyone agreed that it was a motion of no confidence." 

A 2010 briefing note from the House of Commons Library had suggested that some ambiguity remained. It stated that it was "not clear whether a defeat on a motion or issue of confidence would count as a vote of no confidence for the purposes of the legislation.  For example, it is not clear whether a defeat on the Government’s budget would be considered as a vote of no confidence." It went on to suggest that "One possibility would be for the Government to make it clear before such a division that they considered it to be a matter of confidence; then the Speaker would certify it as such. This would effectively allow the Government to table a constructive vote of no confidence." 

But the Commons Information Office confirmed to me that this was not an option legally available to the government. 

I asked earlier whether, rather than resigning, Cameron would abandon centuries of parliamentary convention. It turns out he already has. 

David Cameron addresses the Global Investment Conference in London on May 9, 2013. Photograph: Getty Images.

George Eaton is political editor of the New Statesman.

Photo: Getty Images
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Why are boundary changes bad for Labour?

New boundaries, a smaller House of Commons and the shift to individual electoral registration all tilt the electoral battlefield further towards the Conservatives. Why?

The government has confirmed it will push ahead with plans to reduce the House of Commons to 600 seats from 650.  Why is that such bad news for the Labour Party? 

The damage is twofold. The switch to individual electoral registration will hurt Labour more than its rivals. . Constituency boundaries in Britain are drawn on registered electors, not by population - the average seat has around 70,000 voters but a population of 90,000, although there are significant variations within that. On the whole, at present, Labour MPs tend to have seats with fewer voters than their Conservative counterparts. These changes were halted by the Liberal Democrats in the coalition years but are now back on course.

The new, 600-member constituencies will all but eliminate those variations on mainland Britain, although the Isle of Wight, and the Scottish island constituencies will remain special cases. The net effect will be to reduce the number of Labour seats - and to make the remaining seats more marginal. (Of the 50 seats that would have been eradicated had the 2013 review taken place, 35 were held by Labour, including deputy leader Tom Watson's seat of West Bromwich East.)

Why will Labour seats become more marginal? For the most part, as seats expand, they will take on increasing numbers of suburban and rural voters, who tend to vote Conservative. The city of Leicester is a good example: currently the city sends three Labour MPs to Westminster, each with large majorities. Under boundary changes, all three could become more marginal as they take on more wards from the surrounding county. Liz Kendall's Leicester West seat is likely to have a particularly large influx of Tory voters, turning the seat - a Labour stronghold since 1945 - into a marginal. 

The pattern is fairly consistent throughout the United Kingdom - Labour safe seats either vanishing or becoming marginal or even Tory seats. On Merseyside, three seats - Frank Field's Birkenhead, a Labour seat since 1950, and two marginal Labour held seats, Wirral South and Wirral West - will become two: a safe Labour seat, and a safe Conservative seat on the Wirral. Lillian Greenwood, the Shadow Transport Secretary, would see her Nottingham seat take more of the Nottinghamshire countryside, becoming a Conservative-held marginal. 

The traffic - at least in the 2013 review - was not entirely one-way. Jane Ellison, the Tory MP for Battersea, would find herself fighting a seat with a notional Labour majority of just under 3,000, as opposed to her current majority of close to 8,000. 

But the net effect of the boundary review and the shrinking of the size of the House of Commons would be to the advantage of the Conservatives. If the 2015 election had been held using the 2013 boundaries, the Tories would have a majority of 22 – and Labour would have just 216 seats against 232 now.

It may be, however, that Labour dodges a bullet – because while the boundary changes would have given the Conservatives a bigger majority, they would have significantly fewer MPs – down to 311 from 330, a loss of 19 members of Parliament. Although the whips are attempting to steady the nerves of backbenchers about the potential loss of their seats, that the number of Conservative MPs who face involuntary retirement due to boundary changes is bigger than the party’s parliamentary majority may force a U-Turn.

That said, Labour’s relatively weak electoral showing may calm jittery Tory MPs. Two months into Ed Miliband’s leadership, Labour averaged 39 per cent in the polls. They got 31 per cent of the vote in 2015. Two months into Tony Blair’s leadership, Labour were on 53 per cent of the vote. They got 43 per cent of the vote. A month and a half into Jeremy Corbyn’s leadership, Labour is on 31 per cent of the vote.  A Blair-style drop of ten points would see the Tories net 388 seats under the new boundaries, with Labour on 131. A smaller Miliband-style drop would give the Conservatives 364, and leave Labour with 153 MPs.  

On Labour’s current trajectory, Tory MPs who lose out due to boundary changes may feel comfortable in their chances of picking up a seat elsewhere. 

Stephen Bush is editor of the Staggers, the New Statesman’s political blog. He usually writes about politics.