The thing about street food (and, for clarity, I'm referring to Borough Market-style grab-and-go street food)is that it brings a lovely sense of community, wandering around in couples or small groups enjoying quality (albeit expensive) burgers or wraps. I used to work near Borough Market and Friday lunch in decent weather was always spent hanging out round the stalls. The other thing is it's really annoying trying to eat and walk - especially with small hands and being a slow eater, really difficult to juggle food with oozing sauces and napkin and purse and drink... I often ended up walking my burger back to the office and eating it at my desk - pointless, I know. But at least I got to wander round aimlessly for a bit. Might just go check what the OP said. ETA I recommend Borough Market, but I'm sure someone else already covered that