Hi Gillian, talk about serendipity, I was just looking at this yesterday! I found some pictures on flickr, and it might be worth contacting the guy who put them up. Hiking through the Jungle | Flickr - Photo Sharing!
I knew I'd seen another link of interest but it had fallen off the bottom of my history list. Worth a read, particularly the comments of the guy who was in the ANC. I'm sure that threats were sometimes issued in african villages but in general black people volunteered. Think of how hard the selection process is to join the Gurkhas today. The Brits were patronising racist gits but the people they were fighting were a damn sight worse! BBC NEWS | Africa | The Africans who fought in WWII