I love the Sandeman's tours! We have done them in Brussels, Amsterdam, and London and they have…read morealways been great! In London, we did 2 separate tours, the free 2.5 hour walking tour (just FYI make sure to tip at the end) and the Old City Tour which lasted about 3-3.5 hours.
The free walking tour was a great introduction to the city and meets in Covent Garden, which is centrally located on several underground lines. We went through Westminster, Trafalgar Square, and past the National Gallery. We also walked past St. Jame's Palace and Buckingham Palace and through St. James Park. We saw the Horse Guards Parade and witnessed the changing of the guard at Buckingham Palace. We saw Westminster Abbey, the Houses of Parliament, and the Churchill War Rooms. Our guide was originally from Portugal but really knew his London history and culture after living there for 12 years. He definitely made the tour entertaining and informative.
The Old City Tour focused on the City of London (which is actually incredibly small) and its history. We began in Covent Garden and ended at the Tower of London. In between we saw the tower bridge, London Bridge (it's not impressive actually), Big Ben, St. Paul's Cathedral, The Church of the Knights Templar, Mansion House, the Bank of England, the Royal Exchange, the WWII Blitz area, where the fire of London began, and the barristers courts. We also saw the old jail and the current courthouse. Our tour guide was actually originally from Canada and is a history teacher in London. He was very entertaining, perhaps less theatrical than our first guide, but more historically informed. I believe the tickets were 12 or 15 pounds each.
Sandeman's is a great company and I highly recommend all of their tours in the cities they have them in!