but it was on the rear fuselage of a Spitfire

Was the serial visible?

N3200 had been shot down on 26 May … so … never made it to Dunkirk.

Funny, I always thought N3200 made it very much to Dunkirk, but failed to make it back.
http://www.aircrewremembrancesociety.com/raf1939/stephenson.html

The Type G retained its armament and presumably its gunsight.

No, it didn’t retain the reflector gunsight. It featured only a very simple gunsight consisting of a ring applied on the surface of the windscreen and a bead mounted on top of the bulkhead.

My source says that the date on the stone, 4th of May, means it MUST have been him, if it wasn’t, the British wouldn’t have bothered to write it, then they would just not write a date at all, and that makes sense to me (19th Squadron and the Pole put aside)

DCK, your source is plain wrong. I don’t know aboout the 19 Sqn pilots but ‘The Pole’ (F/Lt Leslaw Szczerbinski) was killed on 4 May 1945 attacking German shipping off Wangerooge and has no known grave, either, so I can’t see why he should be ‘put aside’.

Second, he’s very critical towards how the British treated fallen comrades, that there’s a pattern in it, how they gave less “thought” into South Africans, New Zealanders, Norwegians etc and cared more for the pure British. A controversial opinion perhaps? I don’t know what you chaps think of it?

I think if his research was more careful he’d have more right to say so. Or should I call it a pattern of giving less “thought” into Poles, Czechs etc and caring more for the pure Norwegians.?

My feeling is, given the appearance of the Fw190, that the photo is more likely to be taken after the end of the War. According to the movement card SR419 was CatAC/hit by flak on 4/4/45 and then CatE on 31/5/45.

Steve, I think Cologne was captured by the Allies some time in March 1945, so by the time SR419 landed there it was more or less ‘after the war’ in that area. Anyway, cat. E meant (if I understand correctly) just transferring the aircraft’s paperwork to another place in the files (so the squadron could get a replacement aircraft). Can we rule it out that after SR419 was declared damaged beyond repair it (or whatever was left of it) remained wherever it had been? I guess the photo may well have been taken after VE-Day.

In my view the hood is missing altogether as I just can’t discern any framework.

Although I agree that there seems to be no hood on the Mustang, you might want to note that the Malcolm hood used on these aircraft did not have any framework other than two rails at the bottom that attached it to the sides of the fuselage.

PK-D Mustang Mk.IIIB (P-51C) FB225 (batch FB125-399)

Unlikely.
There seems to be no trace of D-Day stripes on the Mustang, so this photo was taken during late 1944 or later. The scenery doesn’t look like winter time, so probably spring of 1945 or later. FB225 was lost with the pilot, Sgt Jozef Donocik on 21 February 1945. I think this is a subsequent PK-D.
This could be SR419 (no code known) in which Sgt Tadeusz Pertkiewicz was forced to land at Cologne (Köln) on 4 or 6 April 1945 (I have two dates so either one source has a misspelling or he landed there on the 4th but suffered another engine failure two days later).

It has been stated elsewhere that there may have been a clerical error on 607 Squadron re P3535 AF-C. This is totally wrong as no less than five 607 Squadron pilots are recorded as flying it: Will Gore, Francis Blackadder, Peter Parrott, Bobby Pumphrey and George Fidler.

Not necessarily ‘totally wrong’. Hurricanes in France are certainly not my area of research, but I believe there were quite a few well documented cases where the serial number of a particular aircraft was repeatedly and consistently misspelled in various documents (such as both ORBs and individual pilots’ log books). As an example, 308 Sqn’s F/Lt Wandzilak was shot down in Spitfire PL279 ZF-Z in August 1944, this aircraft having been used by the unit since June, but all squadron documents only ever referred to it as PL269 (which, incidentally, was the serial of the previous ZF-Z, sent away from the squadron in June 1944).