English football clubs enjoy a high profile around the world, leading to many companies vying to do business with them. But have some football clubs entered into financial deals with companies with questionable backgrounds? File on 4 explores whether clubs are vulnerable to companies and individuals who use the reputation of English football to lend credibility to their activities. But what due diligence do clubs undertake when securing such deals? Allan Urry looks at the relationship between soccer and sponsorship. He hears from some of the victims who've lost money, because they believed those who do business with the biggest names in football, could be trusted. Reporter - Allan Urry Producer - Emma Forde.