Vintage RSPB Board Game from 1938.

Hi. New member here. Keen birdwatcher and part time antique dealer. I have just come across a wonderful old 'Bird Card Game', produced by a company called J.M. & Co. Ltd. for the RSPB, in 1938. It has a linen board, sets of 13 beautifully produced playing cards with different bird images, sets of 'stop' and 'go' cards, four lovely metal motor car playing pieces, a die and shaker cup. The objective is to travel around the country by car, returning birds to their sanctuaries, dealing with the various hazards that birds face, along the way. The whole game is very much designed around the conservation principles of the RSPB.

All parts are in great condition and hardly used, if at all. The only problem is that I can't find any reference to the game at all, or the manufacturer, in any of the resources we normally use! Has anyone ever come across this or is there a record in an archive somewhere? Any thoughts appreciated! 

Thanks, Clive.