In a separate development police have also confirmed that they have received a complaint about work minister Tony McNulty's expenses claims.

BBC: Ministers defend expenses claims

Detectives investigating the alleged leak of expenses claims made by Cumbria's police and crime commissioner (PCC) have made a third arrest.

BBC: Richard Rhodes

Mr Prowse was invited to the Commons by Mr Duncan after he was filmed digging a pound-shaped hole in the Rutland and Melton MP's lawn in protest at his expenses claims.

BBC: I won't sack Duncan, says Cameron