On rooftops and in tunnels, city farms lead food revolution

Salad plants are already being grown in old bomb shelters but floating dairy farms and 16-storey food towers could be next

Only the Northern line tube trains rumbling through tunnels overhead provide any clue that Growing Underground is not a standard farm.

The rows of fennel, purple radish and wasabi shoots could be in almost any polytunnel, but these plants are 100 feet below Clapham High Street and show that urban agriculture is, in some cases at least, not a fad.