Start with a market that still rewards browsing. The best food weekends leave room for queue time, a second coffee, and a small detour when a stall looks better than the plan.
For London, build the route around one anchor meal and two lighter stops. That keeps the day flexible and makes it easier to compare transport, opening hours, and booking requirements.
Bring a small tote, a refillable bottle, and enough space in the afternoon for a bakery box. The city is easier to enjoy when the food plan is specific but not overpacked.