For the sake of argument I believe that recessions tend to hit smaller businesses first, so if you’re a big bank you can wait for the round of bankruptcies that follow a recession and go shopping.
The main reason I can see for banks wanting to leave though, is freedom from EU regulation.
Yep - freedom is one thing (although note that banks, now matter how shiny the brass plaque on the door, are filthy bastards with nothing in the way of making money - London is earning a reputation as a completely lovely place to launder) - but with less oversight, they will behave in worse ways.
Good question… Any speculation? I’m kind of at a loss, too, as it seems is everyone else here.
How about this, maybe? The revelation of who funded the remain vote actively worked against itself? After 2008, no on trusts the large banks, especially the American ones. But I’m sure that all these organizations that funded the remain campaign also had contingency plans for a leave. I’m sure they can wrangle a win either way over this.