The Flight Radiotelephony Operator’s Licence (FRTOL) permits the operation of an Aeronautical Radio Station in a UK registered aircraft.
General information regarding the FRTOL may be found on the CAA web site here
To obtain the FRTOL a successful pass is required in both the Communications theory exam and the RTF practical test. It is not unusual for student pilots to have completed some training and possibly the Communications theory exam as part of their ongoing NPPL or EASA PPL/LAPL training and they just need to pass the RTF practical. Other applicants arrive having already been issued with a flight crew licence of one sort or another.
A pass in the RTF practical test is valid for the grant of the FRTOL for 24 months from the date of the successful test. However, where the RTF practical test is taken together with the theoretical knowledge examinations for the issue of a PPL, LAPL or NPPL and all examinations are passed within an 18 month period and application for the FRTOL is made as part of the pilot licence application, the RTF practical test will be valid for twenty-four months following the final theoretical knowledge examination sitting.