@Carolyn
It very much is the case and has been for pretty much all the time since Brexit.
Read again - UK to EU, nothing to do with EU to UK.
The instrctions/law/rules/regulations online on the DEFRA website, EU to UK, do not agree with what has been posted here or what I have received from DEFRA in emails.
Or the one UK specialist society that I am aware of have just spent £150 for nothing, to cover sending seeds for their exchange, to France.