Probably not if I had to guess, but trade deals between the EU and Britain still need to be worked out, and that trade needs to be facilitated by customs enforc

Probably not if I had to guess, but trade deals between the EU and Britain still need to be worked out, and that trade needs to be facilitated by customs enforcement which there hasn't been infrastructure for before between the EU and Britain. Complicating the issue is Northern Ireland which effectively falls under the jurisdiction of both. If British products need to be sold there, they need to be distinguishable somehow from the versions that are allowed to leave Northern Ireland into the rest of the EU. That combination of shared jurisdiction and lack of trade infrastructure is how you get these labels. Its the laziest solution to a self-imposed problem.