There is this in today's paper...
http://www.guardian.co.uk/culture/2012/jun/21/jimmy-carr-apologises-error-tax
But, that reads much the same as other situations where 'government spokespeople' are playing catch-up with a breaking story in the press. Lots to say about 'stars' doing this and that and a bit about HMRC winning their cases in front of tribunals. BUT challenging such schemes was, and possibly still is, easily avoided over lunch with a hand shake.
Jimmy Carr and his ilk are peanuts compared with Vodofone etc.