Doping is endemic in Olympic sports, the Russians seemed to have carried on from the old Soviet days in thinking they can dope with impunity they are just the unfortunate scapegoats for all those who haven't yet been caught. I don't believe the UK Government would be directly involved with doping, I do believe there are institutions in the UK who are. I think this is probably true of all nations, they have subcontracted their doping to Universities and sports "scientists".
I also doubt there are very few truly clean sports out there. Snooker has had its problems, darts too. Anyone ever seen any pictures of Mike Tyson when he left prison in 1995 and then what he looked like when he got back in the ring a few months later? If that wasn't through drugs then my mother is a ferret!