This is a change, the rules were as long as you operate on an ICAO license then all privileges of the UK license are honored and the first time you renew the UK one everything is reinstated. I know a one off approval was issued to some TREs to conduct UK tests but that has stopped because the CAA said that it was nor necessary. Now there are no current/approved CAA TREs in EK.
The only way to renew is to go to the UK and Find a Sim. and a CAA TRE oh and about £1500.