I stumbled upon an all vegan shop in London called Vx near my hotel and it was completely adorable.
It's quite small, but they sell prepared food, frozen desserts, vegan meats and cheeses, shoes, clothing, and accessories.
I took the Mint Choc Chip Cheesecake for dessert.
And a Strawberry Pud for breakfast the next day (which I ate outside the Tate Modern). Both were amazing...must try and find them here in the states.