I stopped preferring British produce when I read about the farmers cheerfully using toxic industrial sludge on their fields: https://www.bbc.co.uk/news/articles/c3e5y85p488o

I guess others are no angels either, but at least they have regulations with teeth and less corrupt politicians.

Just buy what you want and certainly do not _prefer_ British. If they don't care about your health why should you care about their bottom line....