Not sure, but I have seen a report in the PRO (sorry….NA!) relating to the break up and crash of a Defiant in, I think, that area. Diagrams and photos in the file indicated the crash was caused by “faulty” repairs to battle damage sustained to the airframe during 1940. I only briefly scanned the file as I was looking for something else, but have a feeling it may be this incident? Worth a check! Andy Saunders