My late husband, Duncan Slater, bought his first Leica camera with an inheritance in the mid 1950s and went to New York. The pictures he took reveal a city that is the same today - and totally different. He recorded three districts living side by side, Manhattan, Harlem and China Town, - and world’s apart.

As a member of the British Diplomatic Service, he travelled in Hong Kong, Japan, Arabia, India, Pakistan and Nigeria, capturing on film landscapes and lifestyles that have vanished within one lifetime. He was at Base Camp on Everest when he and his Sherpas were the only humans in a wilderness of rock and snow, in Abu Dhabi when it was still a huddle of barasti-roofed huts around a mud fort, and in Kano when the dye pits flourished in the marketplace.