When we are coming back to London, be it for the 2nd or 10th visit, there are still things to explore and enjoy.
These itinerary ideas are based on the assumption you have already seen Big Ben, The Houses of Parliament, Westminster Abbey, London Eye, London Aquarium, London Dungeon, St.Paul's Cathedral, Tower Bridge, The Tower of London, Buckingham Palace, Changing of the Guard, St.James's Park, The Mall, 10 Downing Street, The Household Cavalry Museum, Horse Guards Parade, Churchill War Rooms, Trafalgar Square, Nelson's Column, National Gallery and National Portrait Gallery, The British Museum.
