By Lori Ewing MANCHESTER, England (Reuters) – British billionaire Jim Ratcliffe, who attended his first Manchester United game on Sunday since striking a deal to take a minority stake of the club, called his investment the most “exciting” endeavour of his life. “I have done a few exciting things but this caps it all, there’s no question about that,” Ratcliffe said during a brief meet and greet with reporters before Sunday’s 2-2 draw with Tottenham Hotspur in the Premier League. “I am very excited to be here.” Ratcliffe, who grew up a United fan, said because of the regulatory process, he could…