The tantalising prospect of an election battle between Rupert Murdoch and David Cameron mesmerised Westminster yesterday, before the media tycoon moved last night to kill off the idea.

The genesis of a "Sun versus the Tories" by-election was a 40th birthday party thrown for Rebekah Wade, the tabloid's editor, on Thursday night. The Sun, the principal media cheerleader for Gordon Brown's contentious 42-days detention proposals, was outraged by David Davis's resignation. A characteristically unrestrained leader in the tabloid yesterday, headlined "Crazy Davis", fulminated against the former shadow home secretary's "shabby act of treachery" and "petty grandstanding".