If you are into computers at all it is an hour well spent.
I am and I will watch after work, thanks Jocko.
I worked for Marconi Radar in Leicester on the same campus as Ferranti. We had some pretty spectacular equipment there too.
We used the 54 series of Texas Instrument TTL chips. The 7400 series were commercial items, the 5400 series were military grade 'nuclear hard', designed to resist the effect of the electromagnetic pulse (EMP) from a nuclear blast.
As a student trainee, we were encouraged to build our own projects, so I built a device to count the ignition pulses on my Morris 1000, displaying a count every 6 seconds. So essentially I had a nuclear blast proof digital rev counter on a 1969 Trafalgar Blue Morris 1000 'Coupe' (it had two doors
).