Funny you should ask that! I've been trying to get the CAA to advise me one way or another, but all they could come up with was:
Unfortunately, while I agree that some detailed guidance on the subject would be useful to the GA community, I have no knowledge about regulations outside those published by ourselves and of which you are doubtless aware. We cannot suggest that a particular course of action would be legal, or even acceptable, without detailed knowledge of every possible applicable regulation, and, as you know, our resources are limited.
Which is ***k all use to anyone, to be honest.