A top City economist has warned of a fiscal shock in the coming months as an exodus of billionaires from Britain leaves the public finances on shaky ground.

Hedge fund tycoon Chris Rokos - who paid an estimated £330million to the Treasury last year - has become the latest to join the exodus.

A top City economist has warned of a fiscal shock in the coming months as an exodus of billionaires from Britain leaves the public finances on shaky ground.