When Manchester City stunned Manchester United 6-1 at Old Trafford on 23rd October 2011, they truly made history. The defeat was United’s worst at home for 56 years and the first time they had conceded six goals on their own turf since 1930. But, more poignantly, the 10-goal swing would ultimately deny United a record 20th top-flight title, and hand City a first in 44 years. Eight goals – and 12...