Digital Ads and International Audiences

Hi all, I'm running Meta and Google Ads currently for a UK training-based organisation. The ads are targeted to specific counties in England. However, most of my leads are being generated by people in the likes of Africa and Asia looking for Visa sponsorship.

Any ideas how I can prevent this? It seems to be happening with both Meta and Google Ads. I have double checked settings on the audiences but for some reason they seem to be seeing the ads?