The UK RT Licence has nothing to do with JAR-OPS or JAR-FCL it is a stand alone UK National Licence! There were two RT Examiners in Malta tested by the UK CAA and appointed by the DGAC Malta. They should be able to do your test which should then be accepted by the UK CAA. They were associated with the Microlight School at Luqa.
Call the DGAC and enquire if they are still authorised. Failing that, there is a list of RTF Examiners here
http://www.caa.co.uk/docs/33/FRTOLEx...ober2009v3.pdf