British Cavalry in North Africa in 1940?

According to Getty, this is a British cavalry charge in North Africa, c. 1940. I can’t find any reference to the British having cavalry there at that time, so if anyone knows the story behind this picture I’d love to know more. I can only find a mention of the last Household Cavalry mounted expedition, which took place in the Middle East in 1941. This photo looks as though it was a very staged “charge”.