As an examiner I have not had one piece of comms from the CAA about this
Many examiners have had no communication in the past decade. The CAA did send all pilots a letter in the last 12 months warning of changes and finally stating that they would not be issuing any further notifications. They have stuck to their word!
There is an on-line Examiner brief and quiz; one might think that would contain all the relevant information, but it doesn't.