I doubt it costina.

impractical to enforce. Imagine if every UK tuner and aftermarket manufacturer had to TUV test its products. Most would go bust as its too cost expensive for most of the small uk manufacturers.

Not forgetting how would you police mods already on cars?? how would you prove that a clean car has older suspension on it versus suspension fitted post TUV which should then have a stamp??

What about replacement parts?? older car parts may not be capable of being made TUV approved so does that mean older cars come off the road because replacement parts arent available???

Also who decides or checks all this??

You couldnt add it to MoT. No MoT station would have the time or possibly have even a small amount of the necessary knowledge (even after training) to know if a part fitted on a car is modified or standard. Let alone checking for TUV stamps would take ages, and a database of such info would be impossibly big and ungainly for implementation through such a testing system. MOT systems use archiac enough old computers as it is

Totally impractical.