Thanks guys.
From the opinions so far, I am now guessing that it was a Marr boat, but there are differences in the superstructure (not symmetrical port/starboard) from the Navena on the plan shown, so at the moment Moretto FD245 is about the nearest. Even then, the fo'c'sle looks a bit different, but this could be the result of the paint job in the original pictures or on the model or the result of a bit of licence. Then again, Marr boats had a yellow hull, this has had one side painted black.
I was offered two boats, one a Carlson tug, which is in ARTR form, and the trawler. I am assuming that the one was to get on the water quickly, the other a long term project. Sadly, too long. Both were said to be kits, but this might not be accurate given that I have not yet spotted any markings on the frames. Sadly, no plans left in the box that they came in, so no clues other than that they date from before twelve years ago, and the builder had been a member of Heywood club and moved to Thornton.