Thank you for brilliant advice, everyone!

I have now checked out the Turkish shop in Sydenham and loved it. Handily, 75 bus goes from just around the corner from my flat (no car, sadly), so will be able to buy these 6kg crates of tomatoes I so crave without pulling a muscle

Didn't make it to the Horniman farmers' market this week but it will happen at some point, I'm sure - I'm curious to have a look around.