Absolutely the best way to do the lights in London. Our guide Olly was very informative where required and adapted to the group who were also very nice. There was a mixed group of about 10, couple of families (including a 10ish your old child), couples and singles. Cycling through London was much easier than I'd anticipated, there's a lot more cycle lanes than i remember and drivers were pretty considerate where there weren't dedicated cycle lanes. You do end up walking with bikes in small sections through some of the busiest areas (Oxford Street, Regent Street & Carnaby Street) but as you have a bike it actually makes it much less hassle than being a pure pedestrian. Will certainly be coming back again (with my 80 year old parents), I reckon this is the best way to see London, enjoy!!