"I am disappointed to see the Vault is not included in your list of London's "secret" museums. Until 2001 the vault was where the Royals kept their treasury in the basement of a Coutts bank on Old Park Lane. When this closed down Hard Rock Cafe' relocated their shop there from the restaurant and transformed the Vault in what is now London's only rock'n'roll museum (as of last Summer we have our museum licence), featuring such gems as Jimi Hendrix' legendary "Flying V", the Beatles' harpsichord and Elvis' coat. Entry is free and it includes a guided tour which lasts about 15-20 min. Opening hours are 11am to 11-pm."