The inadmissible truth about corruption in the UK is that it's endemic. And not just money laundering; the very way governments (both Labour, Conservative, and Coalition) have pursued the business of privatization of state assets since 1979 is uniquely corrupt, on a massive scale.

Hint: corruption isn't just about simple bribery and envelopes full of banknotes passing hand. Ask yourself why so many cabinet ministers retire and end up on the boards of large conglomerates that specialise in bidding for government outsourcing contracts, or why so many long-term viable agencies of government (the Post Office, the Land Registry, the National Air Traffic Control System, the NHS ...) find themselves in need of privatization in the name of "efficiency". You can make any agency -- however potentially profitable -- fail if you run it into the ground through deliberate mismanagement, then show a rebound improvement when you sell it (or the service it provides) off to your golf-course cronies. And when you roll up to the banquet later, there's no evidential chain that can prove beyond reasonable doubt that what you did was grand theft.