We had a great experience taking a 3.5 hour leisurely bike tour of central London with Catherine as our tour guide. She ensured we had a safe and fun experience. We didn't just follow a rigid itinerary, we also took opportunities to take in what the city had to offer. We stopped to watch the filming of a scene from the new James Bond movie. She was also open to stopping when we saw a good photo opportunity. Forget the crowded buses or walking tours, biking London is the best way to see it. Even better is having a guide to make sure you are biking on the left side of the road.