Rainboe
Like you I am old enough to remeber Papa India all too clealry-I was in Staines that very day and my friend and I heard it hit the ground though we did not know what it actually was at the time.
As you say the aircraft looked virtually intact and the wreckage pattern engines aside of course for obvious reasons looks remarkably similar to the TK 737 with the fuselage spliting in a couple of places the tail detached and the nose sort of pointing downward. As I recall the cockpit area suffered rather more severe damage than the 73 did but PI stalled at about 1300 feet as I recall and presumeably had more vertical speed when it hit.
I won't specualte but will just underline that observation that the wreckage looks very similar to the ill fated Trident all those years ago.
PB