A former Tory minister has warned party hardliners that their “dream” of a no-deal Brexit will be blocked by at least 40 fellow Conservatives.

Nick Boles said there was “a lot of support” among mainstream Tory MPs for combining with opposition parties to prevent the UK crashing out of the EU without an agreement.

“I don’t care how many of my colleagues dream of this in the midnight hour. There are not the parliamentary numbers to support a no-deal Brexit,” he said.

“And I will vote, as a Conservative MP, in whatever way is necessary, on whatever motion will achieve the result of stopping a no-deal Brexit.”

Theresa May has insisted leaving without any agreement remains an option – despite her own civil servants warning of food and medicine shortages and huge tailbacks at the UK’s borders.

The prospect has appeared to grow over the summer as the talks remain deadlocked, with some Tories – led by Jacob Rees-Mogg and Iain Duncan Smith – insisting it holds no fears.

But The Independent revealed in June that pro-EU Tories are considering using a “humble address” – the tactic Labour used to force the government to release Brexit economic assessments – to block a no-deal exit.

Now Mr Boles, the former skills and housing minister, has echoed that readiness, arguing his party must pursue a “reasonable Brexit deal that everybody can live with”.

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Tens of thousands of people demonstrated in London on Saturday calling for a second vote on Britain's departure from the European Union. / AFP PHOTO / Niklas HALLE'NNIKLAS HALLE'N/AFP/Getty Images NIKLAS HALLE'N AFP/Getty Images People's Vote march – demanding vote on final Brexit deal A young protestor shouts as she takes part in the People's Vote demonstration against Brexit Getty Images People's Vote march – demanding vote on final Brexit deal A woman holds a placard as she joins EU supporters, calling on the government to give Britons a vote on the final Brexit deal, participating in the 'People's Vote' march in central London, Britain June 23, 2018. REUTERS/Henry Nicholls HENRY NICHOLLS Reuters People's Vote march – demanding vote on final Brexit deal epa06833888 Pro-EU demonstrators take part in a People's March anti-Brexit rally in Parliament Square in London, Britain, 23 June 2018. Protesters are calling for a referendum on the final deal. 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“I can think of 40 Conservative MPs – at least – who will not support a no-deal Brexit,” he told the Financial Times.

Such a revolt would almost certainly be sufficient to deliver a Commons majority to prevent the UK crashing out, teaming up with the opposition parties.

It would be likely to force the prime minister back to the negotiating table, perhaps with a request to the EU to extend the Article 50 deadline beyond March next year.

The crisis could also open the door to a fresh referendum, giving voters the option to remain in the EU, if the prime minister is unable to win parliament’s approval for her strategy.

A deal struck with some Tory rebels in June means a “meaningful vote” motion – to be tabled if no Brexit agreement has been struck by next January – cannot be amended.

Instead, MPs would merely be able to debate the stalemate, even with departure day from the EU little more than two months’ away at that point.

However, under parliamentary rules, a humble address can be laid by a group of backbenchers – as well as by the Opposition – and that vote is binding on the government.

Some pro-Brexit Tories simply believe the no-deal threat strengthens Britain’s hand in the exit talks – but others are desperate for that “clean break”, rather than to accept further compromise with Brussels.

In the interview, Mr Boles, a former supporter of remaining in the EU, condemned “intolerant, intemperate talk” obstructing a Brexit compromise.