The Duke of Hamilton sits on New End in Hampstead, one of London's oldest pubs, trading since 1721 on a quiet street just off the village centre. Wikipedia records it as a long-running local once favoured by actors Richard Burton, Peter O'Toole and Oliver Reed.
Come for a well-kept pint of real ale and, in the basement, the Hampstead Jazz Club. Skip it if you want cocktails or a big night, because this is a village pub first.