The tours are provided with a guide who provides background information at all sights.
The big advantage of these tours is that you can get out at multiple points during the tour to see something or have some food or drink. Later you can get back on your way and continue the tour.
The Original Tour has several tours, including the London By Night tour. This tour London will see when the impossant buildings are beautifully lit. The complete tour takes you around London’s most beautiful illuminated sights in about two hours.
An absolute recommendation!