bear What about the NTBs that are already in place within the EU? Amazon for example is not allowed to operate in Belgium as the Belgian government sees it as a threat to physical shops, especially booksellers. Legislation was passed recently to stop supermarkets selling new released books cheaply, as small bookshops couldn't compete.
As regards tariffs, someone within the Commission and EP has to make a decision to apply tariffs to UK goods and services. I know Flanders is very keen to have tariff free trade with us as are others. What would the imposition of tariffs achieve from the EU side apart from tit for tat on imports to the UK?
I think the UK is still cheaper than parts of the EU for many things, not least heat and light, and I still get more in my trolly for the same spend in Sainsbury than I do in Carrefour, Delhaize or Colryut. I don't buy clothes in Belgium, as it's cheaper in the UK, and there are things I will go back to buy rather than get them here, or pay the postage, as it's still cheaper to do so.
Vets bills seem to be cheaper here, but then vets tend to work as individuals out of their houses with part of the house converted to a surgery, as opposed to a group practice with the concomitant expenses and business rates. I haven't come across a veterinary nurse here either - the vets seem to do the whole thing themselves.
NI - don't know the answer to that one, bur presumably N Sturgeon will have an answer as she will be faced with the same problem if she wins her next indyref and eventually manages to convince the EU to allow Scotland to accede.
Thought this biglobalization.org/.../brexit_and_the_border_discussion_paper_hayward_komarova... was interesting re RoI/NI border.