Radio licensing varies from one country to another. In the UK there is a network of
radio examiners who conduct the licence examinations, some also offer training.
The UK issue the Flight Radiotelephone (Restricted) licence as defined by the ITU; that is all that a pilot needs. The Flight Radiotelephone (General) licence was for professional radio operators and has not been issued here for about 40 years. The licence is the same for all aircraft and there is no differentiation between flight rules. If a UK FRTOL in English is acceptable to your licensing authority, then contact one of the examiners listed.