Dear Keith.
I cannot help with the "signatures", but my daughters father in law Mr Jack Chant was a British Flight Engineer with 425 Squadron flying out of Tholthorpe UK during
the Second World War.
His skipper was Larry White and he remembers another British Crew Member, Bill Brown.
They were shot down over Belgium on the 9th May 1944 and he became a prisoner of war.
We have been with him to Belgium and located the farm where he was hidden for a period. Also met the person who found him hiding in a barn who has sadly since passed away.
He does not use computers, so I said I would put the detail on line in case there are any members of his crew or any information still available.
Hope this might be of interest to you and possibly your research may have turned up anything that may be of interest to him.
Regards
John N Price
(john071039@hotmail.com)