His Ubuntu Learning Trust is drawing on ancient African traditions of co-operation to help Zambians left marooned by the pressures of modern life rediscover the joy of growing food, while simultaneously rehabilitating degraded farmland. Volkova, for example, is a single mother in a war zone; Calliste a black woman from inner London – a demographic rarely reached by mainstream green campaigns. “I was getting more enraged about land inequality – how 50% of the land is owned by 1% of the population”, with people of non-white heritage virtually invisible on the land. The long-term aim, says Calliste, is to buy their own land, somewhere near London. Easier said than done, with land prices as they are – but with her determination, you wouldn’t bet against it.