Andy Burnham was Secretary of State for Culture, Media and Sport for 16 months in Gordon Brown’s cabinet. This was a time in which shirt and tie was the required political dress code for swinging in a children’s playground in Brixton with the Secretary of State for Children, Schools and Family, one Ed Balls. Burnham’s mayoral T-shirt days in Manchester were before him, but with his return to formality on arrival at No10 next week, our new Prime…