With JAR, however, all JAR countries accept without any further formality all JAR licences. So you can fly a D-reg on a UK JAR licence (not NPPL) anywhere in the world, since the licence is accepted by the German authorities. Again, airspace has nothing to do with it.
So to try and clarify this...
A UK issued JAR licence holder could fly a D reg aircraft anywhere in JAR land....
But, for example, the holder of an old
UK PPL/CPL couldn't??? (To answer
JD's further question)