In his quote Cameron appears to be questioning whether the late Sir Ronald Waterhouse and his team carried out their job effectively - I've never heard his personal integrity questioned in public before - even if the remit has often been criticised as too narrow.
First of all, whenever people ask me, why isn't Washington working -- I am a fierce defender of the integrity and hard work of individual members, which is, by the way, matched up by --when you look at polls, people hate Congress, but individual members a lot of them feel are really working hard on their behalf.