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The fighters quit Britain for Syria and Iraq to join IS’s campaign for a single Islamic state.

But a brutal regime of beatings, amputations, beheadings and crucifixions by the terror network has left them anxious to return.

They are trying to negotiate their safe entry to the UK with the Home Offi ce. The would-be warriors hope to escape jail on the grounds they are risking their lives by fl eeing IS.

The mass defection claims were made on the Ask.fm social networking feed of convicted terror sympathiser Mizanur Rahman, slammed for backing the Charlie Hebdo attacks in Paris.

Rahman was asked: “One sheikh told me there is over 500 UK fighters in IS that are working with the Home Offi ce on a way to be allowed to come back and say IS are acting unjustly. Is this true?”

The North London-based radical could not confirm the figures.

A Home Office spokesman declined to comment on the claims.

Metropolitan Police chief Sir Bernard Hogan-Howe told the Home Affairs Select Committee at least 700 Brits have travelled to the Middle East to join Isis.

He said three London schoolgirls who ran away from home to become jihadi brides last month will not face charges if they return as they are not known to have committed terrorism crimes.