"It's not pleasant making Molotov cocktails inside a car - even just a couple of handfuls of them. The petrol spills when you're filling the bottles. The motor oil, which you add to make the contents slightly more sticky - a bit more like napalm - gets everywhere. The fumes fill the car no matter how many windows you open. And when you're working with a chain-smoker tempers tend to flare."

In 1980, after years of civil war, white minority rule in Zimbabwe came to an end. Within months, preparations were being made for a genocidal assault on the minority Matabele tribe.

A decade or...