Oh god not again......
The ONLY time you can log P1/S is following the successfull completion of a skill test with an examiner. Like my recent IR test with the CAA.....
No other time can you log P1/s.
I fflying with an Instructor and receiving Instruction then you are PUT. If you are doing a club checkout for instance on a type you are current on you can claim P1 but most Instructors (especially the hour builders) will take it as P1 for themselves and leave you to PUT.