Coulda woulda shoulda They fucked around and now they are in the finding out phase. There is no way the EU will allow them to continue with their jackasseries. If you want back in apply like a new state and accept the shit conditions new members have to accept. You're not special. You're a shadow of a former great empire and your economy is collapsing. Immigrants? Those fools are actually keeping you afloat while you…
It's quite naive that you don't think the EU is harmed significantly by Britain leaving. The EU would take Britain back in a heartbeat.
We also do not particularly keep the UK (politically speaking) close to our hearts. The Calais situation, pour contact for submarines passed to the UK (and US), etc.
Pour gouvernement is seen as weak when it comes to conflicts with the UK so politicians will need to take that into account as well.