The spectre of Conservative Party infighting over Europe returned today as David Cameron made final preparations for a crucial summit in Brussels aimed at sorting out the mounting debt crisis.

France and Germany want to further integrate the financial systems of countries using the single currency. They also propose an EU-wide financial transactions tax, which, Government sources say, would hit Britain hardest.

Mr Cameron, who will attend the summit tonight, says he will not put the EU deal to a referendum, as it will not involve any transfer of power from Westminster to Brussels.

• Watch Mark Pritchard’s question to David Cameron at the PMQs yesterday

Only those states which have adopted the single currency will be forced to give more of their sovereignty to Brussels.

The Prime Minister insisted his “key aim” was saving the euro, signalling that the repatriation of powers must wait.

But Shropshire MPs have piled pressure on the Prime Minister, with Wrekin MP Mark Pritchard today repeating his call for a referendum on any EU treaty change.

And North Shropshire MP Owen Paterson, the Northern Ireland Secretary, has broken ranks by declaring that creating a more integrated eurozone would make it “inevitable” that the Prime Minister would have to give voters a say.

Mr Pritchard said today: “It’s clear that fiscal union will fundamentally change Britain’s relationships both with the eurozone and with the wider European Union.

“In my view any structural change should be put to a referendum.

“A dominant inner German-Franco EU block would be a considerable shift of power within the EU and it should not take place without the British people being able to have a wider say on the whole European project.”

London Mayor Boris Johnson said Mr Cameron would have “absolutely no choice” but to hold a referendum. EU leaders were “in danger of saving the cancer and not the patient”, he said.

And even some of Mr Cameron’s closest Cabinet allies are understood to be shifting to a much more eurosceptic position, with a five-strong group of ministers planning to visit the Prime Minister to urge him to toughen his stance.

Conservative anger over Europe was expected to be further inflamed today by a German rejection of Britain’s demand that the eurozone rescue deal must include legal protections for the City of London.

See also: Shropshire MPs pile the pressure on David Cameron at PMQs