So anything modified will be MORE tax? I thought anything pre '73 was free modified or not? Maybe newer rule will close this loophole, ie stop you getting getting an old car, make it better/as good as a modern car and get free tax. (not a cheap option to fully restore and modify a classic but in the long run could pay it's self back).
It's true, as time goes on rules become more stringent and close loopholes. (loopholes for the rich are left open however, I wonder why!)
Depending on how many cars you have either solution could be better:
I have 2 which will be standard and one modified. If I got 2 tax free I actually might be able to afford to have all 3 running even if I have to pay more than expected for the 3rd. For example, at the moment the 340 and 360 will cost £430 for the year. A modified 343 if I'm right will be £215, so a total of £645 for all 3. As long as the modified 343 is less than £645 and I get the others free then I'd be better off. Once the 440 got to the qualifying age that would be free too! (Unmodified).
By the way I don't even tax the 2 I use on the road for 12 months, the 340 is 12months but I cash in the 360 at the end of summer, it's untaxed now and I'll tax it 1st June (when it's M.O.T. is done). It's just too expensive, which is stupid when ypu look at how many (few) miles I do. 4000 in total. So what if they give out more CO2, it's still far less than a smart car that does 20,000 miles (maybe

)
Owners of 1 modified 'classic' will of course be rightly well p*ssed off with changes if they create a with bigger tax.