Fascinating, the things which jump to mind when you watch it

The extremely upright position of the man driving the Jag, and his obsession (in the commentary) with thinking about overtaking - but often not doing it

Idiots who overtake dangerously, or stick in the outside lane and use hand gestures are not a new phenomenon

Quite a few overtaking maneouvres with traffic coming head-on

The lack of paint on roads; apart from a few white lines down the middle, almost nothing.

Some junctions totally unmarked with no obvious indication of right-of-way which could've been interesting

Were all cars nothing but a shade of grey?

I have not managed to see the clip yet but agree with ChrisM that overtaking was more prevalent then.

I learnt to drive around that time and overtaking was the norm wherever possible. I still overtake wherever it is safe to this day, working on the principle that on a long journey, if you don't take the opportunity and stay behind the slower driver, that driver is less likely to overtake when he/she catches up with an even slower vehicle. If you want to make progress, that means you now have two vehicles to overake. In my opinion, that is how traffic queues are formed. It's not the slow vehicle causing the hold up, but the driver behind who does not overtake when circumsatncaes allow.