Reddit mentions of Mrs H.S. Ball's Original Recipe Chutney - 16.6 Oz

You could maybe substitute the Nando's with regular chili, but there wouldn't be a great substitute for the fruit chutney. My feeling is that you could probably leave the chutney out to make a version that is more similar to what you'd actually get from Nando's.

However, you can buy both from Amazon, provided you like to spend money. To get the true South African experience, you have to get Mrs Balls' Chutney: https://www.amazon.com/Mrs-Balls-Original-Recipe-Chutney/dp/B008SG5F80/ref=sr_1_fkmr2_1_a_it?ie=UTF8&qid=1466602079&sr=8-1-fkmr2&keywords=fruit+chutney+mrs+balls