There is a little information contained in Roy Nettleship’s masterly article, A Brief History of the GP14 Hull. That can be found in the 75th Anniversary book, 75 Years On The Water, currently on sale from the Association; but that article is reprinted from its original appearance in both The Basic Boating Book and also 50 Years On The Water, the 50th Anniversary book, both of which I have scanned for this site (and they were there last time I looked). Yes; have just checked, and they are both still here.
It is limited data, but it may be a useful start.
Hope this helps,
Oliver
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This reply was modified 3 weeks, 5 days ago by
Oliver Shaw. Reason: Checked website for sources referenced, and confirmed they are still present