Exclusive: Ex-Tory chair in key Yorkshire marginal endorses Labour in tactical election vote to halt Brexit

Tory MP Stuart Andrew narrowly held onto his Pudsey seat in the 2017 election - he is pictured with Morley and Outwood MP Andrea Jenkyns.

Dr Jason Aldiss makes the intervention in The Yorkshire Post after resigning his post – and Tory membership – in the wake of Boris Johnson’s election as Prime Minister in late July.

Why I’m voting tactically for Labour in Leeds after 24 years loyal service to Tories – Dr Jason Aldiss

His decision follows 24 years of loyal service to the Tory party and intensifies the pressure on Pudsey MP Stuart Andrew, a Brexit-backing supporter of Mr Johnson, whose majority was cut to 331 votes in the 2017 election. The West Yorkshire seat is now the 26th most marginal in Britain.

Dr Jason Aldiss is the former chair of Pudsey Conservative Association.

Pudsey is part of Leeds which saw 50.3 per cent of voters back Remain in the 2016 referendum.

Boris Johnson is Tory ‘version of Jeremy Corbyn and Momentum’ – Dr Jason Aldiss explains why he quit the Conservatives in Leeds

Last night Mr Andrew, a Government whip, played down the move, saying: “Jason doesn’t live in the constituency. I know he is very much for Remain but the country made a decision to leave the EU. That’s democracy and we have got to deliver it.”

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Stuart Andrew's Pudsey seat is the 26th most marginal in Britain.

But, writing in today’s newspaper, Dr Aldiss describes Mr Johnson – and “acolytes” like the PM’s chief of staff Dominic Cummings – as “insurgents, chancers and double-dealers” rather than “true Conservatives”.

The Conservative splits in this Leeds seat will determine Boris Johnson’s future as PM – The Yorkshire Post says

He also warns that Brexit – for them – is “about personal advancement and, for some of their number, the misguided pursuit of ideological purity. It will all go horribly wrong”. And, in a further indication that the outcome of the December 12 election will be the most unpredictable for a generation, Dr Aldiss advises people to vote tactically. Labour’s hard-left candidate Jane Aitchison, president of the Leeds TUC, is standing in Pudsey.

He believes that tactical voting, culminating with “an overwhelming vote for pro-Remain parties”, would guarantee a “second Brexit referendum” with two options put to the people – the deal negotiated by Mr Johnson’s predecessor Theresa May or the UK staying in the EU.

Boris Johnson has apologised for failing to deliver his 'do or die' Brexit pledge.

Dr Aldiss says such a vote could be presided over by an interim administration before another general election next year. “Crucially, I include the Opposition parties in this as much as voters. Agreement on which candidate is best-placed in each seat to defeat the sitting Conservative should be the rule rather than the exception,” he adds. “Voters must then play their part by supporting that candidate. Tribal loyalties can resume on another occasion. If I can do it, then so can you. And in case anyone asks, no I will not be singing, humming or whistling The Red Flag as I place my cross on the ballot paper.”

But Mr Andrew, first elected in 2010, said that he was receiving a “very positive” response on the doorstep from both Leavers, and also Remainers, who simply want Brexit “done”. “The real danger is if the number of people saying they will never take part in another election if we don’t deliver Brexit,” he said.

His response came as the PM apologised for failing on his “do-or-die” promise to implement Brexit by Halloween. Asked if he took personal responsibilty for this, Mr Johnson said: “Well, I do.”

And Treasury chief secretary Rishi Sunak, the Richmond MP, left open the possibility of the Tories pursuing no deal Brexit. “I’m not going to comment on the manifesto specifically.”

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Parties in new plot to scupper PM

The Liberal Democrats are not ruling out taking part in a Remain electoral alliance in dozens of seats across the UK to boost the chances of denying Boris Johnson a majority.

Talks have been under way between the unequivocally pro-EU parties of the Lib Dems, Plaid Cymru and the Greens to boost the chances of electing anti-Brexit MPs.

The pact would see two of the three parties stand aside to favour the one with the best chance of victory, replicating the success seen in the Brecon and Radnorshire by-election. Lib Dem leader Jo Swinson did not rule out a report that the pact could see an alliance across up to 60 seats.