Buses provide a potentially useful way of getting around which is thoroughly discussed in the Getting around chapter.
They ARE all, in principle, wheelchair accessible, but can be quite a challenge to use. They’re potentially OK for strong and confident chair users, but our experience was that even then only some 70% of journeys were successful.
In addition, buses are rarely the chosen method of transport if you’re visiting a foreign city – or even if you’re a London resident. It’s so much easier, most times, to understand where the trains go than it is to understand where the bus routes go. We do, however, strongly recommend exploring the Transport for London website, and finding the ‘spider’ maps which are available. There are hundreds of them, covering all thirty-three boroughs, and they can be really useful !