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It is understood the man in custody is James Goddard. The arrest is understood to be in connection with Remainer MP Ms Soubry being harassed outside Parliament during live television interviews in College Green on Monday. Mr Goddard is one of the leading members of the 'Yellow Vest' protestors who came to prominence earlier in the week when some of its supporters were heard shouting “Soubry is a Nazi".

ITV This Morning: Viewers RAGE as Anna Soubry hits out at Met police

A statement by the Metropolitan Police said: "A man in his 30s has been arrested in central London on suspicion of public order offences committed on 7 January. He remains in custody."

Mr Goddard's supporters claimed he was about to hand himself in at Holborn police station at 12pm, according to BBC journalist Daniel Sandford.

Ms Soubry, a prominent supporter of a second EU referendum, was taunted as she was interviewed in Westminster on Monday, and then harangued by a group of men as she made her way back to parliament.

A cross-party group of at least 55 MPs signed a formal letter to Metropolitan Police Commissioner Cressida Dick to express their "serious concerns" about the "deteriorating public order and security situation" outside Parliament.

Speaker Mr Bercow told the Commons on Monday he was “keeping a close eye on events” involving “aggressive and threatening behaviour” towards MPs.