@DRM With all due respect to your retired father, he wouldn't have had to learn, and comply with all the present regs! I know I didn't have to, when I started driving!
For those that wish to see the driving regulations for HGV's, spend a few minutes perusing the following links. These EU rules/laws still apply after our departure from the EU (though there are a few differences, mainly tachograph mode use)
The new digital tachographs can be scanned remotely as you drive past a monitoring vehicle, or station, and enforcement will follow to the driver and company.
My digital tacho card is downloaded at the end of every shift to check my driving hours, compliance etc
Diving regulations
EU regulations changes Aug 2020
These rules have to be observed, alongside the Working Time Directive laws, some of which run concurrently, some of which do not.
Wtd regs