Hi Mike,
It should be the Thorneycroft 72'. No step in the deck, 2 tubes and a twin .5 gun tub aft as usual. If it's numbered, as far as I recall, the numerals ran from the 48 to 60. (54 was transfered to the Dutch - that's the only way I can remember)
I was wrong on the other thread about the motors. I converted mine from diesel (ED Bee) to electric and put twin Navy Geared (2:1 380 size) in, since it was easier than trying to line everything up. These, along with twin 7.2V packs were placed in the space under the gun tub with the radio gear under the foredeck. Props were plastic 2 bladers that just seemed to work.
The original had twin rudders hung from the transom with the horns cutting through slots just belw deck level.
She was timed at Eaton Park in Norwich at just over scale and run time was plenty.
Tony