In the higgledy-piggledy streets of Bethelsdorp, a sprawling South African township once designated for people of mixed race, what at first glance appears to be a colourful new youth movement is gathering strength. Adherents sport blue T-shirts and baseball caps and lug brimming satchels. They roam the streets, knocking on the doors of the township’s shacks and simple bungalow homes.

In the anarchic days of the apartheid era such youths might have been “comrades” rallying local morale against the police. More recently they might have been members of a nattily dressed new gang. But they are not. They are salespeople for a mobile-telephone-based community-banking scheme.