Try Ecco - they make fab sandles with velcro straps that you can adjust for width - pricey but I LIVED in mine for months in my first pregnancy when I had terrible oedema from the 4th (yes!) month and they were so comfy
Clarks do wider fittings in some of their shoes. If you go in and ask they'll show you which ones they have in.
Barratts also do some wider fitting.
Hush Puppies do them too and some Barratts stores stock them.
i've just been on the birkenstock website and have some advice. they come in "narrow" or "regular". I have size 4 1/2 feet but usually can only wear wide fitting size 6! my birkenstocks are called "regular" but fit me perfectly - and are actually a 4 1/2 - the only shoes i've ever had that fit me in length and width!
thanks for the tip about Clarks and birenstocks, very useful! I found a store on Chiltern Street in London called "Elephant Feet" (no joking) that does shoes for amazonians like me. I haven't checked it out yet, but I plan to soon.
Chandra- I had been buying shoes back home on hols (in US, as I am expat here) but that plan won't work long term.
I had a scan a few weeks ago, and the first thing the sonographer said was "hmmm, the baby has some rather big feet"...arrggghhhh!!!!! poor baby!