The Conservative Party is failing to set out the “big vision” the UK needs, George Osborne has suggested as he urged Theresa May to tear up her Brexit blueprint.

The former chancellor said leaked Government economic analysis which showed the UK would suffer slower growth under all of the withdrawal scenarios modelled should prompt Mrs May to rethink her Brexit plan.

He said the Government needed to set out a new “form of Brexit which is not as economically damaging as some of the forms being proposed”.

Mr Osborne was criticised as one of the main architects of the so-called “Project Fear” Remain campaign during the EU referendum and his latest comments are likely to prompt anger among Eurosceptic MPs who have dismissed the accuracy of the forecasts.

Meanwhile, Mr Osborne also suggested MPs could thwart the Government’s Brexit plan and prevent the UK from leaving the customs union.