The Gresham Land Rover is rather a red herring really, how many more stories of death and destruction brought on by amateur car fixers can you find?
Making laws doesn't actually stop things happening, no matter how how smugly politicians claim to have sorted out some issue.
Stupidity can't be legislated against nor can criminality.
I was born in the mid fifties, played in the street, went to school under my own steam and tinkered with stuff to my hearts content.
The whole "thou shalt not" nanny state thing I find irritating to put it mildly.
With or without the EU the direction things are going is pretty clear, you may only do things that you have a paper qualification for, anything else could possibly be dangerous so it must be done for you by a company employing qualified technicians.
You can work, eat, sleep, shop and watch TV. The government will stop you doing anything dangerous