DFC,
Anecdotal evidence suggests that my training organisation/instructor taught me more radio navigation than seems to be necessary to pass the PPL. Even if legal, I know I would be extremely uncomfortable navigating without being in sight of the ground, and I expect many fresh PPLs would be too.
Plus there's always the issue of how to get up/down there - especially the latter if the weather is worsening and there's no hole.
IMVHO, the ICAO standard is tantamount to encouraging people to fly IMC who are not otherwise qualified to do so.
Rgds,
TPK
