Chris Williamson, MP for Derby North, is being challenged to explain why he breached Commons anti-sleaze rules by not owning up to the second property

One of Jeremy Corbyn’s biggest supporters faces demands to apologise to fellow MPs after being forced to declare he has a second home.

Chris Williamson is also being challenged to explain why he breached Commons anti-sleaze rules by not owning up to the second property.

Two weeks ago, The Mail on Sunday revealed that as well as his £250,000 home in Derby, Mr Williamson jointly owned another £215,000 house in the city.

The Derby North MP insisted he thought he had complied with Commons rules.

But days later, he corrected his entry in the MPs’ Register of Interests to confirm his second home ownership.

Mr Williamson last night said he had made an ‘innocent error’.

Tory MP Andrew Bridgen said: ‘He only owned up when the MoS pointed out what he was doing.’