opps78,
I have been told that all P1 hours count towards the 1500 required. I think the problem you will have is that you need to be a QSP, see deinition below.
** Defined as a pilot who has completed a recognised military course of flying training and has been awarded a pilot's flying badge in full compliance with QR(RAF) J727. (Post Certificate of Competence – RN).
hope this helps, Barney Rubble