Those were the days! Every other bloke had a cigarette or roll-up on the go, wouldn't see that now. Also great to see some proper old-style engineering workshops, they take me back (not quite to '73 but to '79).
I'm going to say this once and once only Gene: Stay out of Camberwick Green!
If anyone enjoyed the Documentary, then it's worth googling about the 1973 Norton F750 monocoque motorcycle. Probably the first beam framed bike, designed and raced by Peter Williams. I think most modern bikes are influenced by PW's ideas. I believe this Norton has only just been surpassed by modern MotoGP bikes for its aerodynamic qualities.