The discussion about chlorinated chickens from the US is interesting, as at first, it seemed to focus on whether such food is safer or less safe than UK chickens or European ones. It's not so much about the safety of chlorine, as what it is covering up, possible poor hygiene in raising them.
However, some bright spark in the EU observed that if the UK starts to import food which has less of a safety factor than EU regs would permit, the EU would be very concerned to have a near neighbour doing this, and crucially, might start to vet UK exports of food and animals, with greater severity. This might involve veterinary inspections, borders checks, special inspection posts, and so on. The situation in Ireland could be a logistical quicksand.
An example of unintended consequences maybe. What a nightmare it all is.