I'll disagree about the food bro. London is such a diverse place, you can find any kind of food. It is a good idea to bring Tony's with you if you want to eat traditional English fare. The one exception is the Fish n Chips you get from the local holes in the walls. Little salt and a bunch of malt vinegar. Awesome. It's tough to mess up fried fish. I kept a small ziploc of Tony's in my backpack. Oddly the place I used it most was in France. I was sooooo underwhelmed by French food. I don't go anywhere without it, but that's true for everywhere. Try real Indian food. I ate it all the time there. You will begin to smell of curry though
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My sister actually made money selling Tony's in Ireland.