Hi Valyn, I know your pain as I also have big feet (also size 11, mens or 10 ladies).
Try
http://www.bigshoeboutique.co.uk/ as they stock up to size 11 (ladies) & are based in the UK, I guess you are from the UK as you used UK sizes in your post.
If you get open toed shoes then like me you may get away with size 9s, I do, if the shoes are closed then don't risk it, i've been suffering with a pair of size 9 knee high boots for months now but i've finally stretched them enough to be able to wear them for a few hours as long as I stay sat down

I know I should give up on them but I love them to bits.
Unfortunately I seem to have a phobia about putting any financial details into a website after being caught out by a trojan many years ago so all I can do on these online shops is some virtual window shopping, on the bright side, if i did start shopping online i'd get carried away in seconds so it's probably for the best.