The boat is scratch built,designed by Hal Harrison,contruction plan in Marine Modeling mag.whitch was designed as a freelance coastguard patrol boat .made from balsa/cardboard sise 18" aprox.weight 2.5kg.
Our model is 36"twin motors and all moving parts and weight is 10kg.
This is the latest pictures of Vigilant Star on the lake at NewBrighton Wirral

This was given to me by the Minoros Family from Sutton in Surrey found in a loft after the death of a family member it is 46" long with a beam of 15" and I guess built in the early 1960's.

I think it has been scrach built, but is a copy of the kit above, it has a large petrol engine but I have no idea what cc it is. I would be greatful for any help or suggestions as I require some parts to finish restoring it. and converting it to an electric Motor drive