By Matt Hughes Manchester United may have to scale back plans for a new 100,000-seater stadium on the site of Old Trafford because of a lack of government funding. Sources with knowledge of the £2bn project have told City A.M. that government money will be required to pull off the most ambitious of several proposals that are being developed by the club. United are highly unlikely to get a handout however following the government’s discovery last week of a £22bn black hole in the nation’s finances. New Chancellor Rachel Reeves has already implemented a major cost-cutting programme, with winter …