Hi, TimNeo:
I see this is your fourth post, and that you'll be getting your Sony for Christmas.
To "sort of" answer your question, you don't need to buy ebooks ONLY from the UK. For example, you can use Fictionwsie to buy MultiFormat books for your Sony. In most cases, however, these are not the newer, blockbuster titles currently in release - those titles are DRM'd - but you CAN enjoy many fine, older titles as well as newer books by fledgling writers.
Also, please keep in mind that MobileRead also has quite a large selection of Sci-Fi titles (all free, of course) that you can dowload.
Harry (one of the Moderators here), can specifically answer your questions about Sci-Fi in the UK.
HAVE FUN!
Don
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