Ross Kemp visits the Clapham joke shop at the origin of the Bloodgate cheating scandal that brought rugby union to its knees.

We learn how the advent of professionalism in the 1990s brought a new win-at-all-costs mentality to the sport.

And Harlequins players Tom Williams, Ugo Monye and Nick Easter explain how new coach Dean Richards transformed the club from entertaining also-rans into ruthless winners who began to push the rules to their limits and beyond.

Could a loophole in the laws around blood injuries boost their chances of European silverware?

Narrator: Ross Kemp Reporter/Interviewer: Chris Jones Writer/Producer: Sam Sheringham Story editor: Tom Fuller Sound design/production: Jesse Howard Digital Producers: Sam Huxley and Stephen Trenchard Assistant producers: Metin Yilmaz, Jack Wood, Mujtaba Ali and Victoria Turner BBC 5 Live Sport podcast editor: Matt Smith Commissioner: Stevie Middleton