If ever a band was equally loved and loathed it is Mumford & Sons. Their first two albums have sold over three million copies each and they’ve cracked America in a way that no British band has managed since Coldplay. Their brand of earnest folk rock has taken them to The White House, where they played for Obama, and Glastonbury, where they headlined in 2013. Yet the same sincerity that’s won them legions of fans has brought them an equal number of detractors. They are gentlemen of the middle of the road: wildly successful, but deeply uncool.