They achieve this triumph just four months after the death of former manager Sir Matt Busby at the age of 84 .
Manchester United become only the fourth club in the 20th century to win the league championship and FA Cup double .
Manchester United achieve this triumph just four months after the death of former manager Sir Matt Busby at the age of 84 .
Manchester United become only the fourth club in the 20th century to win the league championship and FA Cup double .