By Harry Brent Manchester United legend George Best once turned out for a seventh-tier side – while still under contract at Old Trafford. The Ballon d’Or-winning Northern Irishman was an enigmatic figure both on and off the pitch. Considered by some to be the finest British footballer ever, his career at the top was significantly shortened by his wild and gregarious personal life. At the age of just 27, when he was supposed to be at the peak of his powers, Best left United after his relationship with manager Tommy Docherty broke down, and all but fell into lower league obscurity. But before he…