This is my Cartier-Bresson 'decisive moment' shot and is definitely in my top 3 favourite photos I've taken. I love the tension of the braced wire frame against Big Ben, and the suspension of the uncertain traveller above the top step. I also like the link between the copy on the bus and the subject holding the London A-Z tourist guide.
Photographed with a Nikon F5 and 18mm lens on transparency film. Converted to a monotone image, which I much prefer as the red of the bus dominates the colour image.