Cameron may have moved first, but Brown has now upped the ante, writing to the Speaker calling for a "root and branch overhaul of the current system". He has told "all Labour MPs" (not just frontbenchers like the Tories) thay must "abide, not by April but as soon as possible, with the Committee on Standards and Privileges' opinion that the employment of family members should be declared". Cameron, of course, set an April deadline.
But enough from me. Guido is on fire today on all this - go read him.