It does seem that the CAA won't be in a position to take over from EASA come April, certainly, Rolls Royce has moved its engine certification to German because of this. Given the CAA will have oversight of all UK aircraft, airlines and airports, will other countries accept their competence?

It seems Heathrow think this is a possibility https://www.ft.com/content/ceb7d6ce-...f-a6a2f7bca546
Borrowing £1 billion is quite a serious step.