Thank you for your question. There's nothing to stop you registering a charity in the UK even if the purpose of the charity and its work relates to Africa. The public benefit requirement extends to international as you can see from the attached guidance note which I hope will be helpful: https://www.gov.uk/government/publications/public-benefit-the-public-benefit-requirement-pb1/public-benefit-the-public-benefit-requirement. I hope that helps. Please leave a positive rating so that I am credited for my time.