Re: Or more accurately..
4. UK tries to come to sensible agreement to the benefit of all parties
Who could possibly not want sensible? It's like motherhood and apple pie.
The problem of course is that "sensible" is such a loaded word. What is "sensible" depends on where you are standing. As far as the EU is concerned, the UK agreed that third countries should not be allowed to develop the system or have privileged access to it, then decided to become a third country and now wants to renege on that agreement.
As far as the UK is concerned, it paid towards it, so it should use it.
But in most negotiations, including Brexit, the party with the biggest stick wins. So from all that has happened so far in the Brexit negotiations, the UK will huff and it will puff, and then accept the EU decision. That's what the sovereignty that the Brexiters want actually means - the EU, the US, and China get to shit on us, and we get to shit on Tuvalu and Tonga.