The EU referendum debate has become a “mountain of exaggeration”, a cross-party group of MPs have warned as they demanded controversial claims from both sides are dropped.

Prominent politicians on opposing sides of the debate called for an “amnesty” as the campaign enters its final month in the hope “misleading” claims about the referendum can be ditched.

They said voters are “thoroughly fed up” with “lurid” warnings about consequences and added the way the campaign is being fought is “impoverishing political debate”.

Some of the most prominent claims of the campaigns to leave and remain in the EU were criticised as pressure built to drop them from leaflets and websites.

A Eurosceptic claim that Britain hands £350 million a week to Brussels was described as “highly misleading” because it does not include money the UK gets back through the rebate.