Matthew Parris wrote this morning:
"David Cameron should now think very hard about putting down a motion of no confidence in the Government, precipitating an early debate next week. Strong arguments against doing so will be urged: it would give the Parliamentary Labour Party a cause to rally unanimously around; it would be resoundingly defeated; and some might call that an own goal. But with a government majority of 66, the Tories are never going to win a confidence debate. The time to call one is a moment when mood and argument, if not arithmetic, is with them. Now is that moment.
In political legend it would attach to June 2008 the appropriate dark significance - and portent of things to come."
Striking while the iron is hot would certainly compound negative perceptions of Brown's government at this time, if they could be exacerbated, but is there a danger that it would force Labour to rally around its leader, much like what happened when Neil Kinnock tried this trick in 1990?
