Police have interviewed one of the commuters accused of assaulting a man who dropped his trousers in a packed London Underground carriage, the Daily Mail can reveal. The vigilante, who has been praised by some and criticised by others, has been questioned by detectives from British Transport Police (BTP) after coming forward to give his side of the story. BTP are appealing for witnesses and are trying to identify the other three men shown brawling with the man, who told them to 'f*** off' amid repeated requests to pull up his pants. The man who exposed himself was initially arrested...