DOZENS of MPs from three parties called on Chancellor Philip Hammond yesterday to honour the £350 million pledge to the NHS made by the Vote Leave campaign during the EU referendum.

Forty-one MPs from Labour, the Liberal Democrats and the Green Party signed a letter urging him to deliver on the commitment to spend £350m a week on the NHS at the Autumn Statement next month.

The letter has been organised by the Vote Leave Watch campaign, which aims to hold the right-wing group to account for promises it made during the campaign.

Vote Leave famously pledged to use the £350m which they say the Westminster government gives to Brussels each week to fund the NHS, and even had it emblazoned on its battle bus.

Since then the pledge was branded “a mistake” by former Ukip leader Nigel Farage and dropped by high-profile members of Vote Leave such as International Trade Secretary Liam Fox, Transport Secretary Chris Grayling and Foreign Secretary Boris Johnson.

The letter states: “We accept the verdict of the British people. Yet it is clear that, if this mandate is to mean anything, it must include the single most visible promise of the Leave campaign — spending £350m more a week on the NHS.”

The letter calls on Mr Hammond to commit to increase national NHS spending by £350m a week above the amount that is currently planned “as soon as this money becomes available by leaving the European Union.”

Vote Leave Watch chairman amd Chuka Umunna said the message was “loud and clear” and the Tory government “will not be able to run away from the promises of Brexit campaigners.”

Meanwhile Scotland’s First Minister Nicola Sturgeon said yesterday that Brexit talks between Prime Minister Theresa May and the leaders of other devolved administrations were “deeply frustrating.”

Ms Sturgeon said that she clashed with Ms May over how to proceed, saying: “We had a frank exchange of views. I don’t mind admitting large parts of the meeting were deeply frustrating.”

Ms Sturgeon said Scotland would bring forward “specific proposals” for a so-called flexible Brexit that would keep the nation in the single market even if the rest of Britain was not part of the trading agreement, in the next few weeks.

Ms May’s official spokeswoman said: “We have been very clear that we should be working together to secure the best possible deal for the whole country.”