Tea-shop boffin who pioneered business IT

A more incongruous sight would be hard to imagine, particularly in 1951. There, at the heart of a vast catering empire devoted to tea and cakes, was a pulsing sci-fi monster with endless rows of tubes filled with half a ton of mercury. The monster’s name was Leo. It was the world’s first business computer and its master, David Caminer, who has died at the age of 93, was one of the great pioneers of commercial computing.