Where could I buy mermaid melody manga in the UK, london?

[LuchiaNanami]

I really want to buy it and I'm not allowed to buy it online please tell me a store were they have it, if checked easons and forbbiden planet and lots of manga and comic shops but I didn't find it....

 

[mmmmmmmmmmeeem]

HMV have an anime section, but you'll pay high prices for anime.
Pretty sure they might have it, they're the only shop that caters to non-mainstream cinema and animation that i know of.