Squishy,
"This was not intitally the UK's position though was it?"
They didnt have a position Squishy.
Youre being silly re the 'teleporter' squishy, but this...
"we develop a system in which the final destination of goods has to be checked as they enter NI, and somehow find a way of tracking those goods."
Again I come back to the UKs proposal, and why its actually quite sensible. I dont think remainers sometimes realise how thorough the current existing customs and transit systems in place are. But quite simply, because I dont want to spend an hour typing why and how the existing systems do work (Ive done that before on another thread sometime back, and it does get repetetive when remainers cant be bothered to find out or ignore it cause its long and boring), Ill go straight to the why its doable.
In short, (and Im certainly not an expert who could probably come up with another 5 or 6 options) there are 2 obvious options they could do. The biggest headache is in fact Irish goods travelling through the UK en route to europe. And vice versa. (Direct trade between Ireland and UK isnt that complex to resolve). The reason the trade route is so important is the quantity of food and perishable goods Ireland sells to Europe. Sending this stuff by sea, to avoid the UK, just isnt a viable option.
Option 1 could be the use of Authorised Economic Operators. (AEOs) Germany and Switzerland, Sweden and Norway use this type of arrangement. It allows businesses to send goods across borders with predetermined health and safety checks. Customs duties are paid quarterly which removes the need to check containers at borders, and both Irish and UK customs can do their random spot checks at any point en route.
Option 2 could indeed be sealed containers quite simply without checks. They use authorised agents who seal them, and authorised agents who unseal. 15 years ago I would have said this option was a non-starter, how many exporters have secured vehicles? What would be the cost to the vast majority of exporters upgrading their vehicles? etc. But today, due to the migrant crisis, the vast majority of exporters that traverse european routes, do indeed have secure units.
There are solutions out there, made a tad easier by the fact we are indeed islands, the issue currently, is clearly the lack of will to resolve them.