Hi K 5ive.
Surely it cant be that hard to do, I know a couple of English guys that have set up shop and doing what you say, and one Czech girl doing it on her own, no doubt there are many guys from the UK doing it and maybe fully legal as well.
So long as you don't try to step on anyones toes have you had a word with any English guys doing it, I do know what you mean with the last bit of your post, but if your intent on doing it you know you shouldn't give in.
And as a side issue they are trying (Not to fast though) to bring in shed loads of new rules on trading cars in the UK, no doubt to make anyone who deals in cars fully compliant and of course if ever a license had to be obtained..A cost attached.
I have been told that the insurance companies that you buy your Traders Insurance policy with, when you re-new it now want your National Insurance Number, and this is supposedly going to be put on the policy. As we know this has nothing to do with the Inland Revenue having a peek.