The Vegan Thread

Who knows a place in London where I can go and find some formal vegan shoes?
I am supposed to show up at a wedding next week and I can't find anything to go with a black suit. My last resource will be a brand new pair of Vans authentic in black but I'd like to try at least to find alternative solutions.

I was thinking about Vx, I know they have some vegan shoes, but I don't remember a huge selection... Any other place in London that might be worth a visit?
The Natural Shoe Store has a few London branches and do stock various vegan shoes: http://www.thenaturalshoestore.com/Article/View/articleCode/Our%20Stores/