I found a great online store where you can find comfortable wide shoes -
Wide Fit Shoes: Extra Wide Shoes for Wide Feet and comfortable shoes - Widefitshoes.co.uk - Wide Fit Shoes
They have a large selection of shoes onlone and in their shop which is based in Harrow, London. They seem to sell extra wide shoes which I have never seen in any shop or online store.
I purchased a pair of Heidi which are so comfy and wide and fit my wide feet perfectly.
Let me know if you need any more info on this shop or the shoes I purchased.