Out of curiosity (and I'm sure its been well covered else where) - how does that work for things like VFR on top. Not allowed as far as a vanilla UK PPL licence goes (no matter whether its EASA/JAR/old school), but in most other countries, VFR on top is allowed on that other countries own version of the PPL licence.
Do other countries then say that a UK PPL holder can fly VFR on top in that other country's airspace, when flying that other countries registered planes? I had understood not...
However a non-aviation example: for the year after you've passed your driving test in Northern Ireland, you are restricted to driving below 45mph and must display "R" plates (rather than "L" plates). However, since that restriction isn't in the rules for anywhere else, if you travel across the water to Scotland, you can take down the R plates and drive at the same speed as everyone else, even though your paper licence says on it you are restricted till X date. So you follow the rules for the location you are in, not your home rules.