So, forgetting for a moment the issue of whether the hours are loggable or not:
1. Is it legal for a PPL to let a non-PPL take control of an aircraft, say just for experience?
2. What about a PPL doing the same as above, in this case though the person taking control also has a PPL but is not type rated on that particular aircraft?
There seem to be so many 'Grey Areas' in aviation.