This walk in a very short distance covers many of London's main sights. ***If you want to see Changing of the Guard at Buckingham Palace late morning at 11am (Sunday, Monday, Wednesday and Fridays - in June/July every day) it will probably be best advised to start the loop at Westminster Abbey. There is also a daily ceremony at Horseguards of the Changing of the Queen's Lifeguards at 11 am. There is also a much smaller afternoon ceremony at Horseguards at 4pm sharp. Get there at 3:45 pm latest to get best view. Stand behind white lines in the "stable yard" part. If unsure where to stand ask one of the charming police men.
Westminster Underground Station
Big Ben & Houses of Parliament
St Margaret's Church
St James's Park