I've just spent a very enjoyable half an hour watching 'From A to B: Tales of Modern Motoring' a documentary about company car drivers, sales reps. It's from 1993 and it's absolutely brilliant. Telly gold.
I remember watching the original TV series and the one that followed it 'Signs of the times' about homes. Both absolutely brilliant. Martin Parr shot the accompanying photos (above) and these TV programmes sparked my love of the great photographer.
Lots of the modern "docu-drama" filming style was taken from these hugely influential documentaries. Particularly their use of the "locked off shot" where the camera doesn't move and the image on screen appears like a moving photograph. If you're a fan of The Office you'll love this programme about reps.