Brian,
many thanks for your help, it's great when you meet up with someone who has a connection with your model by 'being on the real thing'. I will try and source the book you recommended but wondered if there is a general book/web site which gives examples of rigging for merchant ships of this period. My CAM ship to has been around for a while, and like yours has a 'Bob's board' speed control, I'm taking it to the Brighton show so am in the process of giving it a bit of a clean up. many thanks again Roger