The big grocery stores in the UK are Tesco's and Sainsbury's. They probably both have on line flyers to give you an idea. Stick with the basics like pastas, eggs, sandwiches, etc just like at home to keep cost down.
Also, when you are out and about, many bakeries offer pretty good prices on things like pies, sausage rolls, and various pastries, etc as compared with going to eat out at even a fast food place. And food at the touristy places can be pricey so load up on breakfast (the British Museum is about the most criminal in terms of what a meal will cost you!)
Have fun!
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Si vis pacem parabellum.
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