(BBC documentary series, 2011)

It sounds boring, but it's actually a fascinating subject: the history of the UK's national electricity supply network, and the power sources that have supplied it.
Episode 1:
Footage of trams and motor and horse buses in London:




Episode 3:
Albeit distorted, there is nice footage of Lockey's of Bishop Auckland JXN371, originally London Transport RTL48, in use as a works bus - the footage is also used in the 2012 documentary The 70s :

A row of works buses at Dounreay nuclear power station site:

A stylised American school bus:
Footage of the miners' strike features lines of Lex-bodied Metropolitan Police Bedford VAS buses: