I heard that the CAA at Gatwick closed their Brexit office at the end of last year. If they did, someone somewhere knew what the outcome is going to be. And that someone should have realised that being in EASA still means being beholding to the ECJ.
Additionally, so I read somewhere, there are some 65 Open Skies agreements to be renegotiated assuming we are leaving. That raises the questions of majority UK ownership of UK airlines which leaves some big names with big problems.
So, personally, I hope the KISS principal will be applied as regards aviation. The alternative is not appealing the way its going at the moment.