Here is a selection of stores for anime and manga buyers outside the UK, or those who want to import directly. The videos and DVDs on sale here will be American NTSC format and region 1 DVD coding. Make sure you know you can play the format you intend to get. All the stores that sell manga stock the English translated versions.
This store is based in Japan and as such stocks Japanese format videos and DVDs. The DVDs are region 2 coded, so they will work on UK players, but they may not have English subtitles or an English dub track so be sure to check it has what you want before you buy.