Hi Blunty,
LASORS section B1.4 say that as a QSP (qualified Service Pilot, which I assume you are) within 12 months of a flying appointment (I assume you are currently in a flying job) you are exempt from the RTF practical test. It also says that if you have passed the JAR-FCL communications written exam (which I assume you did with your PPL) you are exempt from the written exam.
I'd say therefore that you have met the requirements for issue of an FRTOL (if my assumptions are correct) and simply need to apply. Check your pms!
Happy landings
3 Point