 Complete the following phrase:  He helped the club win the league title in 1956 and again in 1957. Nicknamed Twiggy by his teammates, he was renowned for his versatility. He began his career as a left-half before the emergence of Duncan Edwards in this position, when he switched to the forward positions, but the Manchester United manager Matt Busby recognised his intelligent positioning sense and aerial power and chose to play him at centre-half by the 195556 season, with John Doherty and Billy Whelan now competing for his former position, although he faced fierce competition for the solitary centre-half place due to the presence of Mark Jones. He covered in goal in the 