Dave, please pass on my thanks to Jim.

I have thought from the first that the prop fitted to the ‘Beest in the original photo that I posted was so very much similar to that fitted to the Swordfish. That is why I originally thought it might be a 4 AACU aeroplane.

Have now obtained digital copies of the 100 Sqn ORB and the appendices for that period. No mention at all of a non-standard fit. In fact, no mention of the accident either. So, unfortunately, still none the wiser on that count.

Thanks for the help.