Fred, and all of you great guys..........
Engine now working with lots of lovely water coming out from where it should be.
Turned out to be the box on the gearbox
which was badly corroded and blocked
Inlet pipe to the gearbox
was removed and seawater was seen, reconnected and
exhaust pipe disconnected - no water......arg......
Box and hoses replaced, impeller replaced, heat exchanger cleaned, now everything working fine.
due next week and then I get to sail her for the first time.....whoopeeeee...
Thanks for all your help guys.