If I fly this weekend, i.e. qualified but without my PPL in hand
Sorry to tell you but until the guys at Gatwick issue you with a PPL you are not yet qualified, and are still a student pilot.
If you want to fly this weekend and log P1 time, then fly solo authorised by your instructor.
If you took passengers, then the instructor is P1 and you are Pu/t whether he touches the controls or not, because he does hold a licence that allows him to carry passengers, and as such I would think he would expect paid for his time.
Anyway, congratulations on passing your skill test and hopefully your PPL will be issued soon