Maybe as the consumer sector swings from UK products to EU products, people will gradually lose the tie to their favorite UK brands.

When the covid pandemic hit here, we started getting our groceries using the "curbside pickup" method, where you put in your order on line and somebody gathers the stuff from the shelves for you. Often there were/are shortages of the specific item we requested, so they substituted something different. We have learned about several new brands that we had previously avoided--avoided out of habit.

If NI consumers get into the habit of buying {struggling to quote an actual example} flour, say, with a German brand instead of an English brand, then perhaps they will be less insistent on maintaining a special exception for the English brand. Maybe?