By Matthew Cooper The designers responsible for Tottenham’s new stadium have drawn up plans for Manchester United as new co-owner Sir Jim Ratcliffe considers the future of Old Trafford. Ratcliffe wants United to have a start-of-the-art stadium and will need to either renovate Old Trafford or build an entirely new ground. Speaking on the Geraint Thomas Cycling Club podcast earlier this month, the Ineos chief hinted at plans to increase capacity to 100,000. “You have got this opportunity if you choose to, to build a completely new ground, because we have got enough space,” Ratcliffe said. “If yo…