In 2010 she came close to causing a general election upset when she reduced Labour MP Austin Mitchell's majority in Great Grimsby to just 714 votes.

BBC: Ex-Conservative Victoria Ayling says more to join UKIP

Despite the recriminations - dubbed an "assassination festival" by Labour MP Austin Mitchell - Mr Campbell has insisted he still regards Mr Mandelson as a friend.

BBC: Mandelson inquiry 'over in weeks'

Labour's Austin Mitchell said a vote in favour of a referendum "will show a thing or two to the people that they can trust us because we have their interests at heart".

BBC: EU referendum bid rejected by MPs