Coincidentally, I'll be in London for those same three days before meeting my gf in Paris. I'm also going to the Chelsea v. Watford game on the 26th. For a tour, I decided to do the Sandeman Walking Tour as it seemed that I would get the most out of my time there. If not, I'm also welcoming any suggestions.

As for food, are there any "must-eat" things I should have? I land in LHR on the 26th, so an English breakfast is a must along with other food.