'Ello, 'ello, 'ello. PC Porkiepie is on the case again

Rod Liddle, normally a Jeremy Clarkson soundalike has a bash at the Met. What interests me is this adoption of the left liberal clothing by commentators who are normally "vox populi". The comments are reasonably fair, and suddenly Blair Peach is a martyr too, even though back then the Rod Liddles were totally with the police. Why have they changed sides? How does it further the attack on Gordon Brown?