Old Hairy - Great anecdotes by the way - I have a disposition list of Sunderlands which shows Rochester-built Mk 5 RN269 as "Damaged on landing, Philippines 28/6/53 - SOC". This machine had belonged to 302 FTU, 230, 201 and 205 (from Sept 1950), though I have it down as coded M, rather than P. Might be a contender for your machine?
I think I got the crash info from "Last Take Off" by Colin Cummings, ISBN 0 9526619 3 4 (Nimbus Publising)
Hope this helps.
Paul