Hi Howard,
Thanks for your suggestions.
Have not tried the Sunderland Museam, but finally ran a Series 4 GA down at the Tyne and Wear Museam. Have also been in touch with the Roker Model Boat club, they have sent me a set of the original builders plans for the Series 3 version. Once I get them intend to copy and retain electronically, so could send you a set if you do not mind waiting.
The card model is too big for me, I want someything around 40" long.
Have also got that book, which is very enjoyable.
Newcastle Museam also have some uncatalogued drawinsg which may alos include builders plans but they are not sure yet.
Best Regrads
Rowen