lots of nice markets, brixton and borough. if you're staying somewhere that has cooking facilities grab a bit fresh fruit/veg, cheese, artisan bread etc while you're adventuring.
also, im sure theres plenty of curry or kebab places where you can get a cheap and dirty feed.
i believe its better to spend more money on good food and eat less because holy shit there is some amazing fucking food over there.
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c h e e k y n a n d o s
That's ham, not bread.
Fun fun yum yum