I did this last night and bought a Discworld book from Fictionwise (as the first store I tried wouldn't sell me it as my IP address wasn't from the US).
This was so simple to do, can't believe I didn't try it earlier
I may need to tinker with the format of the lrf to get it just how I'd like it, but not bad at all.
So, ya-boo to Waterstones looks like I have plenty of content without you