Yes people do carry out work on their own cars however, a car has to pass an annual safety inspection before it can be used on the roads. If this has not been done then the local constabulary will be having a word with you and can take the car off you, hit you with penalty points and a fine.
Not the case mate...
A car has to pass an inspection once a year, it can be used for at 364 days after DIY work on it.
I'm sure there are mechanics out there who are complaining about untrained people doing "potentially deadly" work on their cars.
Life cannot be risk free, it's a fact. As someone has said, should be stop Tesco from selling a chicken in case an untrained person undercooks it and gives the family food poisoning?