Wow!
I'd usually say "vote with your feet" in this instance, although I'm not sure many of us are in Mclaren territory anyway, I hardly see a TZUK ban on buying will hurt their bottom line.
On a side note, anyone watch the Shmee150 supercar vids? I was tagged into the Mclaren video a few days ago after watching some of his recent content on Youtube, but I've taken his channel off my alerts now - very very boring watching him spurt over all the nice cars he has or "sharing the experience" as he buys a new one. Or plugs his mates insurance company. I remember his garage tours and supercar reviews which were very entertaining to watch.