I've just come across this post and will endeavour to help you where I can. The other two people you need to contact via email are Rob Bowater and Jerry Brewer - they both have a wealth of Whirlwind photographic data in their collections.
So here we go:
1. P6974 HE-M 263 Sqn https://www.worldwarphotos.info/gall...irlwind-p6974/ (said to be Aug42, when aircraft was in MU)
This photo is incorrectly captioned wrt the date - it should be late August 1943 and was probably taken at RAF Manston just before Operation Starkey in early September 1943. The White stripes etc have often been incorrectly attributed to the Dieppe Operation in August 1942. Based on the entries in their respective ORB neither 137 nor 263 Squadrons were involved in the Dieppe Operation.
Please feel free to email me and as I've said I'll help where I can.