After a long search I finally found my Dad's old +4 up for sale. The seller wasn't interested in the history I had, and although I asked him to pass on my details to the new buyer, he's either not done that, or the new owner isn't interested either. Shame, as it features in many books and articles, and I have details of the original spec/sale and owner (my Dad was the second)and a whole bunch of photos from the '50's. This identity would have been lost when it was exported.