British billionaire Jim Ratcliffe said becoming a co-owner of Manchester United is a "great honour" and "responsibility" after his purchase of a minority stake was finalised on Tuesday. The 71-year-old's investment, which will give him control of football operations at the 20-time English champions, was approved by the Premier League and English Football Association last week. It was announced on December 24 last year that Ratcliffe had agreed to buy a 25 per cent stake in United from unpopular owners the Glazer family in a deal worth around £1.02 billion ($1.3 billion).