Just a quick update to the last post, the partially sunk boat is now back in the water, dry and with two of the batteries re-connected so the bilge pump will at least work. The engine is full of diesel and waiting for the starter motor and alternator to come back from being rebuilt before the engine goes back together. The heat exchanger/header tank is also being repaired as it has corroded through over an area of around 5" by 3" and leaks like a sieve as I'm sure you can imagine.