Cheers Geoff - I've just checked and they are the same number --> 236-520-44 if I could borrow that it would be fantastic. I'm going to try 14/45 first and see how I get on but if I want to go a bit taller I'll come and find you.
I don't suppose a steel one will slow you much. Would you mind fitting a bit more ballast as well? say another 40 kgs of lead in your belly pan?