Tory MP Patrick Mercer is no fan of David Cameron. News that he was about to resign the Conservative Party whip triggered speculation he was about to join UKIP. Or that he was about to say Cameron should be challenged for the leadership.
However, the decision was prompted by a newspaper story which was due out tomorrow. He is facing allegations over lobbying and failing to register his activities.
Mr Mercer says he has referred himself to the Parliamentary Commissioner for Standards. He has also decided not to stand as the MP for Newark at the next election.
Mercer was forced to leave the Shadow front bench in 2007 when he said it was acceptable to refer to ethnic minority soldiers as "black b*****ds."
Downing Street says the Prime minister is aware. But he won't be choking on his Spanish cornflakes on his Ibiza holiday that this particular MP has left the family.