Made or assembled? big difference. Think you will find most are assembled using mainly foreign parts. And the crap strength of the pound does not make these cars cheaper for export when they are made using parts bought outside the UK. This was all on the BBC some time ago. The UK motor industry is still a basket case.
When I go to a decent restaurant I don't expect the chef to lay the eggs. That doesn't take away the skill with which he assembles my food, the money I pay for it, the taxes he pays, or the people who he employs both directly and indirectly. It still seems to be a pretty worthwhile venture to me.