In london we dont stick to timetables cause busy routes like the 3 always end up getting late. Instead london buses operate by maintaining vehicle gaps within the service. the only routes you will find sticking to a timetable would be the nonfrequent and elderly people routes
Also night buses run on times rather than headway which the maintaining of gaps, London buses used to run on timetables until iBus arrived as TfL were loosing way too much mileage. Night buses aren't perfect due to running on a timetable but it means you can drive faster, there's still timing points but after Brixton on the N3 it really is a rocket down to Anerley and after Anerley they get faster until Bromley North lol. There's a rule within bus companies that they only put the reliable drivers on the night rota and it's very hard to get on to! Sorry I used to work for Metroline so I know first hand how time is critical at night.