David Cameron took a swipe at Boris Johnson over the EU referendum as the two top Tories came up against one another in the House of Commons for the first time since the London Mayor declared his support for Brexit.
The Prime Minister used a statement to MPs to dismiss the idea - reportedly floated by Mr Johnson - that a Leave vote could be a prelude to securing a better deal in a second referendum.
And, in what seemed a lightly-veiled reference to the Mayor's apparent ambition to succeed him as PM, Mr Cameron told the Commons that his own pledge to step down at the general election meant he had "no agenda" other than the interests of Britain.
Making clear that a Leave vote would be followed by withdrawal negotiations under Article 50 of the Lisbon Treaty, Mr Cameron said: "Sadly, I've known a number of couples who have begun divorce proceedings, but I don't know any who have begun divorce proceedings in order to renew their marriage vows."
His comment was greeted by loud laughter from Labour MPs directed at Mr Johnson, whose own first marriage was dissolved in 1993.