I did a quick google of 'large size ladies shoes' and was pleasantly surprised to see a few new shops have opened in the UK. Lou Lou Shoes have opened up in Lutterworth, Leics, with a reasonably priced range of sizes 8-11. Big Catwalk is another I wasn't aware of. By the way these shops could have been around for a while, but I've not been shoe shopping for ages due to lack of funds!
Domestic Sluttery have also got a page they're keeping updated so I'll cross reference with that to make sure I'm up to date with my links. I know that some of those featured to the left have now closed down, which is a shame.
Also just discovered: Zinnia Shoes in Malvern, Worcs, with a fantastic range of very reasonably priced flats and heels in all sorts of fab and interesting colourways. And Pretty Big Feet - not sure if they're already on the list as I can't check while typing a post!