I recently was in Scotland with friends and we had fish and chips for dinner one night. We did have vinegar but I also brought some 10 varieties of hot sauce with me from the states. I can tell you with all confidence the sauce was gone the next day because it made the fish edible.
I also had haggis and loved it because it was seasoned, and in general, I noticed all of the good British food was, surprise, not from the English region.