Not something I know anything about, but have you thought about contacting the Imperial War Museum?
Below is a link to their contacts page:-
https://customerportal.iwm.org.uk/contact-iwm/Fill in all the boxes marked with
*
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] and then see below:-
When you get to this section - Which branch does your enquiry relate to? - Choose London
What type of enquiry? - Choose question
What is your enquiry about? - Choose Other General Enquiry
You then carry on and explain what you would like to know.
I've no idea whether they will be able to assist you but it's worth a try. Hopefully they can suggest where you need to look if they can't help.
