"They are a bunch of incompetent public school boys who are easily conned by "consultants" - but I do not believe they are actually corrupt."
I strongly disagree. :)
In practice they are *very* competent at looking after themselves, their cliques, their donors, school chums, and their mates.
The evidence indicates that competence in their appointed role isn't actually necessary or required in order for them to continue to enjoy a successful career in government and politics.
In Today's UK government we are seeing are a bunch of ministers that are sponsored to enact particular policies by 'Thinktanks'. They don't actually need to have any competence or interest in the policies at all - their appointed "consultants"/SPADs are there to do the legwork for the 'Thinktanks' so they don't have to. Anyone stands in the way of the implementation of those policies because they put their duty to their appointed role before compliance with the wishes of the 'Thinktanks' are persecuted, hounded out or replaced with a malleable crony.
Not every politician follows this mode of operation, but sadly the current cabinet are very much on board with the 'Thinktanks' doing the policy making - all the folks who didn't toe the line have been forcibly removed.