As for banging tunes, you are better going down the london shop (or ringing the london shop - they process+post for you directly) as they are weeks ahead of the website with releases (which is run out of brighton).

Supprisingly www.music-head.de in Germany stocks shed loads of London stuff and has a massive catalogue of other techno sub-genres, cheap in £ with the exchange rate and really good eggs. great for diversifying yer listening and has recommendations.

Worth a punt is Gemm for finding end-of-release copies in bazaar minor outlets,

Also...
EUKrecords
Chemical Records in Bristol.
Mad records