Tory defections - who will be next?

In his resignation letter to David Cameron, Quentin Davies the now Labour MP for Grantham and Stamford, states:

'Under your (David Cameron) leadership the Conservative party appears to me to have ceased collectively to believe in anything, or to stand for anything. It has no bedrock. It exists on shifting sands. A sense of mission has been replaced by a PR agenda.'

He is, of course, absolutely correct, but who will be next?

Nominations are open!