I was selling a mould for a 41 Long Colt on eBay a few years ago. It was listed as for sale in the US only. However, some guy from England contacted me and wanted to buy it. I told him no, I did not want to get caught up in foreign laws on what was legal and not legal. He told me it was perfectly legal, just ship it. I again said no. His return email ripped me a new one. I blocked him afterward.
From what you say later on, it does not appear that it was legal. It is for a cartridge handgun with readily available bullets, cases, powder, primers, and dies. I have NEVER seen a gun for it with a 12” or longer barrel. Guns for it were made up until WWII. It is NOT percussion or muzzleloader. What is the story about the 41LC in England?
Apparently Brownell’s UK sells molds (ahem...moulds) but the variety looks limited. My guess is that something as unusual as a .41 Long Colt mold can’t be found, but is legal.
https://www.brownells.co.uk/Reloading/Bullet-Casting/Casting-Moulds/Handgun-Moulds
I'm not sure - I'll have to look it up.