Thanks guys for all the help so far. First prt of call is to try the local dealers and see if they have a standard prop in stock.
Thanks PeterR for the offer of a prop, but unfortunately I think it will be too big.
I have decided that the only two sizes that I am willing to fit are 13.25 x 15 or 13.25 x 17, most likiely the latter as it seemed to work ok on the boat.
I will see what I can turn up locally this morning and if that does not work, then it's royal mail special delivery all the way!!!
p.s. I think my hull is emptying properly because as I go faster the boat DOES become more rolly polly, and when I slow down I can feel it filling.
I reckon standard prop and lift a hole is the best option at the min.
If anyone has any better ideas, please continue to contribute.
P.s. Stainless or alu?