I have just purchased (it arrived this morning) a Rocket Gold Star Instruction Manual from this seller.
http://www.ebay.co.uk/itm/BSA-Instruction-Book-Rocket-Gold-Star-650-A10-RGS-Motorcycle-Manual-/281831221768?hash=item419e732a08:g:tbcAAOSwd0BVrAci I have posted the web page address in case anyone with an RGS might be looking for one too. The manual is a reprint of the original BSA owners book first printed in January 1963. I will warn you that the price is quite steep at £17.99, but that price includes postage and packing, so viewed in that context it is not that much dearer than many other similar books. The book itself is excellent quality. Obviously this not an essential purchase, but I think it is nice to have if you have got an RGS, or even an RGS rep. I have been looking for one of these for ages so I am a very happy bunny.
John