Episode 1
Footage of coal miners at work and on strike includes Lockey's of Bishop Auckland JXN371, originally London Transport RTL48, in use as a works bus.
The same footage appears in the 2011 documentary series The Secret Life of the National Grid:
Also of note is this clip of Yorkshire Traction 793 (YHE242), a Leyland Tiger PS2/3 rebuilt in 1963 with a Northern Counties doubledeck body: