Hi, John.
Your boat is the M.S. Dolphin. Kitted by the Model Shop, Newcastle on Tyne. Mid 1950's into the 1960's if I remember correctly.
They also kitted a smaller, and much simpler model, also called Dolphin at a later date. These were designed by T.R.Kennedy who did
most of the design work on the company's other kits of boats,ships and flying model aircraft.
Your Dolphin is missing it's dinghy and maybe it's windscreen. Can't tell from the photo. How do I know all this. ? I used to help produce these kits, and others, when I worked at the Model Shop not long after leaving school. I must be an old teenager now.

I have a set of plans for Dolphin which the Shop reissued a few years ago before closing down. If you need any further info just shout.
Alan.