As a Muslim in the UK, why do British people eat pork when the UK was founded as a Christian nation and true Christians follow Leviticus which forbids any unclean animals including pork?

I would question the notion that the UK was founded as a Christian nation. We’re more likely to have been colonised by Romans. Prior to that, we would have lived in groups of villagers who would have warred with neighbouring tribes. While we were doing that, we would scavenge and eat whatever we could find. This is where we traditionally learnt to cook our leftovers, including stews, where we’d reuse every last scrap to make it last. When it came to pigs, we found that we could use intestines to wrap meat to create sausages to store. Our religion may have changed over the years, but some people still prefer to follow nomadic traditions. Not everyone will do what you say, despite how illegal you may make it. And what is classed is an unclean animal? Does that mean that if you wash the meat first, it will be OK?