From my understanding the problem is not for next week but will be in 2 years time when the transition waiver(s) ends. The future of the 50 or so UK citizens working for EASA is also an issue. , some of them carry very valuable expertise in EASA , some might want to apply for the UK CAA but the salaries are not the same and since most are there since many years , all might not want to leave their current homes in Cologne and the CAA might not want to take them all.
It would have been so much easier for everyone and made much more sense technically for the UK to remain in EASA as they could have, even with Brexit.
With this situation , decided on pure political grounds, both organizations , EASA and CAA are weakened .