An introductory tour of London may take half a day, or more, depending on how much you want to include. At its simplest, we would drive around central London, seeing all the major sights and making short stops for photographs. You would see the Tower of London, Tower Bridge, London Bridge, the Financial District, St Paul's Cathedral, the new Millennium Bridge, Shakespeare's Globe Theatre, the Old Bailey, Fleet Street, Trafalgar Square, Piccadilly Circus, the main shopping areas, the theatre district, Whitehall, the Horseguards, Downing Street, the Houses of Parliament and Big Ben, Westminster Abbey, the Royal Parks, Kensington Palace, some of the museums and galleries.

With more time, you could include short visits to any of the following:

The Tower of London
Westminster Abbey
St Paul's Cathedral
The Changing of the Guard