In the middle of the 1970s, as cracks were beginning to appear in South Africa's policy of racial segregation, a young photographer set out to record what life was like under such a political system.

Then in his early 20s, Steve Bloom - now better known for his wildlife photography - witnessed the hardships facing black South Africans, and the force used by the authorities to try to quell protest.

His images - some never seen publicly before - are now going on show in central London. Take a look at some of them here.