Thanks folks!
I thought that after all the hassle of the float struts, I'd do something simple. I'd bought a resin torpedo to use and had thought I'd just need to make new fins and shorten it a little (length of Mk X 14" torpedo was 15 feet 6 inches, which made the resin item 5mm too long). I duly shortened it but it looked too stubby....then it occurred to me that I hadn't checked the diameter. It should be 4.9mm....it was 6mm!
So I decided to scratch build it. A piece of 4.8mm tubing was cut to length for the main body and two pieces of 3.8mm rod inserted, one in each end, to give the correct length. These have had miliput added and when that is dry I will put it in a drill chuck and sand down the ends to get the correct nose shape and taper on the tail.


At least it makes a nice change from struts!
The length of the torpedo was supplied by a member on another forum, who also pointed out that the lower ailerons are shorter than the upper ones...something I hadn't noticed. I looked into it and sure enough, there are quite a few pics in the DF that clearly show them to be 2 ribs shorter! So I have started to correct those too, which may mean a repaint of the lower wings but at least they'll be correct!
Thanks for looking in,
Ian