Evo7
No sure on a couple of points that you made.
I understood that the pilot has to hold a current & valid licence, rather than a lapsed one. Revalidation flights are probably allowed as they take place while the licence is still current. Training for an IMC rating is probably allowed, but training for the initial night rating (or whatever it is called under JAA) would not be allowed at an unlicensed field, as it would involve take off & landing after dark.
Perhaps a JAA instructor, could confirm or correct the above, please.
beammeupscottie
A pilot holding a current PPL, can fly into an unlicensed airfield (subject to consent of the airfield operator, of course, & most unlicensed fields are PPR)
If you own your own aircraft, then you need to read the insurance policy to see if it covers flights to unlicensed airfields.
If you are hiring from a club or school, then you need to ask first. Some schools require hirers to get permission from the CFI , before going to such fields. This is often a condition of the aircraft insurance. The reason for this is that "unlicensed airfield" includes everything from the superb KEMBLE, with its main hard runway of over 1800m, down to Farmer Giles' waterlogged grass strip of 350m. The CFI will take into account, the airfield, the performance of the aircraft, & the experience of the PPL hirer.