Imagine you and your family live in a big house in a neighborhood. One day, some of your neighbors from a faraway place called Britain come to live in your neighborhood too. These neighbors bring some of their things with them and start living in their own houses. They even set up some shops and businesses in the neighborhood.
Over time, many more British people come to your neighborhood. They build more houses, open more shops and start to work on the land. Eventually, there are lots and lots of British people in your neighborhood.
This is what happened in Africa many years ago. The British people came from their home country and set up their homes and businesses in different parts of Africa. This movement of people is called the British diaspora in Africa.
The British diaspora had a big impact on Africa. They brought new technology and ideas with them, which helped some African countries develop. But sometimes, the British people treated the Africans unfairly and took advantage of them. This wasn't fair and caused a lot of problems.
Today, some people from Britain still live in Africa, but the number is much smaller than it used to be. They have become part of the African communities and have helped shape the history of the continent.