I believe the UK CAA has stopped issuing UK licences and is waiting for the introduction of "UK Part FCL" licences on January 1st.
All non-UK Part FCL holders can continue to fly G registered aircraft for at least two years. It may be that one will have to surrender a non-UK Part FCL Licence in order to obtain a UK Part FCL Licence as one's medical records will have to be transferred to the UK if a UK Licence is required.