Robin
You have had the facts presented to you in any number of ways. You are literally choosing not to listen to the point of sticking your fingers in your ears and screaming LaLaLa.
The terms of multiple grey market suppliers have been linked and reproduced. Some of us have explainred how HMRC works and why people can get away with this. I'm judging no one; this is exactly the same as breaking the speed limit. In a risk / reward calculation the rewards are high and the risk of being caught is low. Some people will feel that they're entitled to break that law, some will do it enven though they feel that it's wrong and some will feel very strongly that no one should be doing it.
What you're trying to do is pretend that the law is unclear, or that it doesn't exist. It does exist, but if you choose to ignore it, you're highly unlikely to get caught, and if you do get caught, the business enabling your law breaking may even help you out.
Hope that's clear enough.
By the way, I sometimes break a speed limit, and I may in the past have bought grey market items, I drink more than I should and I may have fornicated. But I'm comfortable with my life choices and not pretending I don't understand the repercussions of them. If you're not happy with the tax evasion involved in buying grey market goods, stop buying them, if you want to keep buying them - at least acknowledge that the evidence clearly says you're not paying the tax due.