PPL(G)
The PPL(G) may become an NPPL(G) at some point, but it probably won't amount to much more than a change in the name. As there is no ICAO standard for Gyroplane licencing the PPL(G) is a UK-specific qualification.
As it is the PPL(G) uses the NPPL medical and the exams are the NPPL(M) ones with the exception of aircraft technical, and Air Law which has a couple of gyro-specific questions.