UK issued medicals that were transferred before exit day are recognised, and now cannot be transferred because you can't transfer SOLI into an EASA State from a non-EASA state. If you have all the certificates for licence issue, all UK issued before exit day and all still valid, at the last look some Member States would still accept them (it was Austria and Denmark) because the advice from EASA not to do so was not an EU Decision, only an EASA recommendation, it had no legal force. Of course you would need a new EASA Class 1 held in the member State.