Lots of people are currently talking about Scotland (and perhaps Gibraltar) doing a Reverse Greenland, which means that the UK would leave but Scotland (et al.) would remain within the EU.
I don't think that's particularly likely for the following two reasons:
- A Greenlandic solution doesn't mean that Greenland is independent in all areas where the EU is representing Denmark. Instead, Copenhagen is ultimately in charge of these areas (unless they're devolved, of course). In other words, if Scotland achieved a Reverse Greenland solution, Westminster would for instance have to conduct their own trade policy for England while representing Scotland in Brussels at trade summits. It would lead to a lot of conflicts of interest at Westminster, and I don't think Brussels would like this at all.
- As Craig Murray has pointed out, there's no legal basis in the EU treaties for having a territory of a non-member state as a member: "The European Union is an institution which is based on treaties which have legal force. There is nothing whatsoever in any of those treaties, and nothing in any existing arrangement with any state, that makes it possible for part of a state, even a federal state, to be inside the EU, when the state itself is outside. [...] The Greenland case is not in the least comparable because its relationship with the EU is based on the fact that it is an autonomous territory of an EU member state, Denmark. That is completely different from the situation of an autonomous territory of an EU non-member, which the UK will be." I presume this means that the only way it would work would be if the UK remained a member, and England and Wales then left the EU (like Greenland). Given the size of England, I really can't see this happening.
However, I think it's absolutely correct and proper that Nicola Sturgeon explores all options before calling a second independence referendum.