Eating cheaply in Canary Wharf is about strategy, not luck. You have to avoid the shiny restaurants with the blackboards and the waiters who hand you a menu without prices. Instead, go underground, follow the crowds of office workers in sensible shoes, and grab a seat at a counter.
Remember: a £6 banh mi eaten in a busy food court tastes better than a £20 salad eaten alone in a glass atrium. I mean it. The secret to this place is knowing that everyone is secretly hunting for the same affordable joy. Now go get that katsu curry. Your wallet—and your taste buds—will thank you.