Back to the market, with much better results. Three healthy bunches of radishes for £1, a very substantial broccoli for 50p, and even some organic bananas.
I cycled round town, and superimposed the track on a filtered version of a street map.
Perhaps Birmingham was once a group of radish fields clustered along the sandstone ridge, with myriad paths branching out and looping back round them. Perhaps, instead of cycling past warehouses and office blocks, I was making a circuit of all the vegetable patches, and stopping in at the market where present meets past.