Demand grows for inner-city gardening plots as Covid-19 pandemic ravages U.K.

It may be a small plot in Osterley, west London, but it has provided Karen Peck’s kitchen with row upon row of cabbage, cauliflower, broccoli, fava beans and garlic.

But Peck, 60, gets far more out of her allotment than just fresh food.

“It’s so tranquil. I have a favorite robin who comes to visit, then the blackbird turns up, and...