It's amazing - the regulations regarding the logging of time under JAR are really simple, and yet many people who should know better (ie. Instructors) are regularly telling students and PPLs the wrong thing and getting them to log P1S for all sorts of things that they shouldn't be.
If it's a successful skills test for a licence or rating, the candidate logs P1S and the examiner P1.
At
all other times only one person can log P1 at any one time.
By definition you can't log P2 in a Single Pilot Aircraft.
Therefore all other flights must be logged either P1 or PUT. If the flight is logged PUT, the instructor or examiner can log it as P1.
Note that the general (and IMHO sensible) JAR principle of only one person logging pilot in command in a Single Pilot Aircraft is at variance with the FARs, where there are many cases where two people can log Pilot In Command
cheers!
foggy.