The engine has gone back to the yard that put it on in the first place. I have since had two people ask if they can buy it - typical
. If you're interested I can give you the phone number of the yard...... It will probably go for about £4k.
I spoke with Barnet Marine who built our boat and they basically suggested a 21" prop. At least as its a new engine, the yard said they will change it if needed.
Took it out for a run tonight as it was so flat over here - 30mph @ 3000rpm 6.2 gph. Not too bad really - oh well, new engine should be here by the weekend.