Change in aviation happens at a glacial pace compared to many other industries. To suggest that the CAA is competant to deal with aviation matters one day and not the next, due to Brexit, is a nonsense.The same rules and regulations will apply for years before there is any significant divergence between the CAA and EASA. Plenty of time to come up with agreements to ensure cross border compatibility. The FAA don't seem concerned that British aircraft will fall out of the sky the day the UK leaves the EU. Just more political posturing and the chance for extensive and expensive executive negotiations in warmer climes I suspect.