And yet in this post
http://www.pedelecs.co.uk/forum/threads/oxygen-s-cross-st-vs-momentum-model-t.26708/#post-353738 you wrongly chose to leave out the legal implications, when knowing full well what they are. I can only assume that you did just the same to the three people that you also gave verbal advice to yesterday.
You could argue and say that it is up to the buyer to research the law prior to purchase, which of course it is, but equally when potential buyer is seeking advice, and you offering it, then you should also point out the legal implications. A potential new ebike buyer may not be aware of the facts, when you indeed are.
Perhaps you could/should start by going back to the afore mentioned thread, and amend your reply accordingly.