Hi There - I just noted your post on RAF site - followed you here & joined -  basically to inform you that I have photos of WJP in the middle east on service.   I don't know if you found anything on him - I am just setting out to find data.   He and my mother were obviously very fond of each other. I only have his letters/postcards to her - which are "love letters" as far as censorship and 1940s etiquette would permit.   I have just finished photographing them prior to donating them to the imperial war museum. I would be happy to email copies to you if they are of any interest.
regards
Dick