Are British people Interbred?

British people are Mongrels The British Isles has been invaded so many times i watched Nick Griffin Dna Test on Youtube it turns out British people have Sub Sahara African North Western European Northern European South Eastern European Eastern European and Middle Eastern in their genepool so does this mean British people are Interbred do British people look Interbred everyone says British people are inbred and look inbred i'm not convinced that British people are inbred and look inbred i'm convinced that British people are interbred and look interbred.