The Nanny and The Blue Lamp? Just what these two anomalies are doing sandwiched together on DVD is anyone’s guess. The former is a campy 1965 Hammer chiller about a bonkers nanny, played by Bette Davis in familiar kabuki make-up. The latter is a breathtakingly obsequious 1950 Ealing Studios tribute to the Metropolitan Police Force, which introduced the world to Dixon Of Dock Green.