UK merchants and the UK taxman have been ripping off UK commoners forever.
Not saying your local pricing isn't competitive, but there are global shipping choices now that we just didn't have even as recently as the 90's. That should be pushing prices down in the UK, but for some reason, it isn't. Yet other things, like machine shop tooling, are cheap...it's inconsistent.
You can buy a Leaf traction motor in the US for the price of two UK vacuum pumps, to put it in perspective. Of course, you have to wait for a foreign-procured good to arrive, unlike the prompt deliveries you get from her majesty's postal service.
Seriously, good luck selling it. Someone will buy it for God, Queen, and Country, at least.
ftr, that's not my listing