Some points to considerT
~............................Europe demands they get started on the divorce.
Other than in divorces as we know them, we have here a case where only one partner can file. As long as s/he doesn't do that, there's no divorce initiated and thus the marriage remains. In this case Europe can clamour as much as it likes, the decision of when to invoke article 50 lies with Britain. Repercusions of whatever nature on the financial market notwithstanding.
France wants to move the Calais border back to the UK asap..
......which would necessitate that France cancel the agreement with Britain. Invoking the EU (and the Brexit from it) on this issue lies neither within France's nor within Britain's possibilities, the EU has nothing to do with this just as it never did.
Scotland is pushing forward with a new referendum.
The outcome of which, should it proceed, is far from already settled. Where the thin margin remain-in-the-UK result of last time was triggered to a considerable extent by the desire to retain EU membership via London, that condition has now been changed (Scotland not getting what it voted for). OTH the trepidations wrt future uncertainty over how long it would take to gain (for the first time) EU membership via independent application are not off the table now. It's doubtful that the EU, alone by its natural sluggishness of process, would be even able to incorporate Scotland overnight if it wanted to.
But yeah, an issue for
England nevertheless.
Northern Ireland is seriously thinking about changes and fears going back to a closed border to Ireland.
Brexit screwed up (or certainly will) things for people there, sure enough. What needs remembering though is that it's Sinn Feinn that's calling for a leave-UK move and Sinn Feinn far from represents all of N. Ireland. The current set-up (now endangered) of free passage of goods and people and no border control pleases (pleased) everyone but that its abolishment would push indispensable Protestant support for what must ultimately (by Sinn Feinn ideology) be coming under Dublin rule may at least be questioned.
Even Gibraltar is thinking of leaving the UK some how to stay part of the EU... which is.. wow.
Gib leaving UK to become independent EU member has as much chances of success as a snowball in Hades. In fact hell will freeze over on the day that alone Spain ever agrees to its EU entry. Spain wants it back and always will do and is already calling for joint governance with the end goal of re-integrating it into Madrid rule. The Gibraltarians will cling even closer to England alone on finding protection. Fear of (and hate for) Spanish rule cancels everything else out, even the probably ensuing financial and economic meltdown that isolation will bring.
It's most tenable avenue is hoping for a UK-EU deal that is governed by prudence on both sides and allows for free movement of people and goods (among other things).
Which may be long in coming, seeing how:
No one is running the country
well, not at the moment
so far it isn't and if it does, we'll have to wait and see what the extent will be.