If you have Amazon Prime and some time to kill, they have a few British videos about buses. The titles that I've found are: "Just Buses", "Buses Around Britain" and it's sequal "Buses Around Britain - Britain's Buses on Show". "Just Buses" reminds me of train spotting. It's just a bunch of clips with buses (mostly double deckers) driving past the camera and the anouncer specifying their makes and models.
If you know of any good bus videos or documentaries, could you please share.