On a different, but I think related, tack:
If I understand it correctly the EASA position seems to be that in the event of a "no deal" exit all existing certifications and approvals held by UK companies will cease to be recognised.
What about Rolls Royce as a Design Authority? Does that mean that in the event of a no-deal then as of March 30th Rolls Royce will no longer be able to offer DA support to EASA operators, and so they will have to ground their RR-powered fleets due to lack of DAOS support? Or would RR somehow be able to maintain an EASA-acceptable DAOS Accreditation (or indeed would an EASA subpartG organisation be able to contiinue without RR support?).
PDR