It's not my fault you don't know what you're talking about
Because the N.I. border becomes a hard land border with the EU but without freedom of movement...
Which is illegal according to the Good friday agreement!
And it is not a 'seamless' process, it is based on laborious negotiations to ensure that standards/regulations are maintained.
Thus when the UK leaves the EU it will have to prove to each and every EU/EEA country that British standards meet theirs.
Which also btw means duplicating more roles to be filled by unelected UKcrats!
Should we do a deal with for example the US, and then should we allow in goods that don't meet EU standards then we would have no corresponding 'throughput' to the EU market...
These standards would have to be upheld, hence the problems that will be caused.
It's a shame that quitters don't understand the 'on the ground' ramifications of their hissy fit!