My son still works in London, and says that since Chairman Boris got rid of the bendy-buses, the vehicles provided are never adequate for the number of passengers, though at least in London a Night Bus is one that runs after midnight rather than one that runs after (or even before) tea-time. When I lived there I always used a Travelcard so I could get anything going, and I still do if I'm in London and likely to need a tube or train.