Before you try and play it I would suggest you contact the British Museum or even perhaps Pathe News - these old records weren't designed with
modern equipment in mind and vica versa! You could easily destroy it.
I would think these things are pretty rare - cardboard not being the most durable material ever made! Treat it carefully and if you do play it,
make a recording on modern media - CD would be good

I would think maybe even the British Motor Heritage Centre at Gaydon could help too.