Off at a slight tangent, but when I did my PPL(A) ten years ago there was no radio nav include in the PPL. It came in with JAR.
The only 'official' training I have had was during the IMC course last year. Before that I was self-taught on Flight Sim!
On a different tangent, there is a commonly held view that because the requirements for NPPL and PPL are so similar, the only valid reason for choosing an NPPL is the reduced medical requirements.