That's not to say they won't restrict mods in the future for cars of any age

. I think we have bigger fish to fry than trying to get free car tax. I saw this today:
http://epetitions.direct.gov.uk/petitions/22251
A guy in Spain:
"Well this is already in place in Spain and other EU countries, both for cars and bikes.
It's called the Anti-tuning law.
No braided brake hoses, no drilled discs (forget about different diameter or calipers), no bigger wheels, no cut down rear mudguards on bikes, no aftermarket suspension, no aftermarket lights or mirrors... You want to put in a bigger engine or chip your ECU ??? don't even think about it.....Need I go on ?
The law came in at the beginning of last year and they were failing loads of vehicles in the "MOT", loads of motorbikes failed because they had non OEM topboxes fitted. Cars usually failed for having bigger wheels than OEM or sometimes bodykits (loads of E30s for Tech 1 and Tech 2 kits), even sunroofs.
Luckily the aftermarket parts industry demanded a meeting with the government and the law has been slightly relaxed (bikes are now allowed Topboxes for example) but if I want to put 15" BBS on my E30 which originally came with 14"s, I need an engineers report, then pay the homologation process and get the details added to the cars documents.
The police here will now stop cars and bikes and do a technical inspection and copmare measurements with the stardard specs, and if it doesn't match an there's no homologation certificate, you're fooked. Gippo vans are exempt however."
"If it goes the same way as over here, there are various "homologation routes" to take.
You can register a car which is over 25 years old as an officially recognised classic, which means that the "MOT" is less strict and more tolerance is given to light modifications.
Alternatively you can register the car as "for competition use" which again allows more modifications but then the test is very different and even more stringent, and I believe there are restrictions on road use, but I'm not that clued up on this one.
But at the end of the day, for people with money none of this is an issue, because if you pay enough, you can get anything homologated by paying for engineers reports and by paying approved workshops to do the work for you.
The ones that suffer are the people who do the mods themselves at the weekends and can't afford engineers reports and thousands in homologation processes. But that is the aim of the change.
I know this won't be a popular comment but to a certain extent I understand it. There are many people out there who should not be fitting V8s to 316i chassis or changing braking systems....."