The springs have to be "legal"? How do they check that
The law demands that any and every part which is not original to the car (not implying the correct spares/ replacements) has to be, 1. a EU approved part, 2. has to be specifically approved for that particular model car to which it’s being applied to.
The examples go as far as rims, tyre sizes, suspension, exhausts, brakes, gear box, steering wheels, spoilers and dozens more..... basically any and everything which wasn’t originally on that particular model car.
When we go for the roadworthy inspection every 2 year, the inspectors will require documentation of all the added/ improved parts which have been, prior to the inspection, inspected and added to your cars documents thus making the car officially roadworthy. Modern suspensions, brake calipers, exhausts, Steering wheels are easily noticible and can cause serious challenges if not pre approved like the springs above.
And if you have H/ historic plates, then none of the above apply since modern parts dont adher to the H rules of authenticity.
If during inspection they discover undocumented add ons, you are given so many days to rechange or come up with the approvals. Till such time, you are considered roadworthy on borrowed time!
And if all the changes go undetected because the young inspectors have no idea of what should be period correct and you are involved in an accident later on, you chance to loose all coverage upon detection of non approved parts making the car road unworthy. And that has some very serious implications since your insurance will not cover you and ask for reimbursement of all expense involved and to the person with whom the collision took place, regardless of whose fault it was for driving an unroadworthy car (due to unapproved parts). A Cop can pull you over at any time and all the addons have to be noted in your documents which you have to have with you..... if he finds the exhaust too loud and it exceeds the decibel stated in your documents, if the suspension looks too modern for your car etc etc, he can impound it on the spot!
Excuse the long and insufficient explanation.