Agreed. It might be a nitch market in the UK but I would think there would be a market.
Reminds me of a shop here in New Hampshire that specializes in Japanese imports. Just posters, trading cards, games, candy, etc all imported from Japan. The owner was pointing out some of the merch he gets in doesn't even last a week before it sells out. He's not able to get some of the stuff here fast enough. He's making decent cash but the store looks empty because stuff sells out so fast.
I've been wanting to take my chances on some of the unusual Japanese trading cards he gets in but I don't know the first thing about them other than they look interesting.