11-00 hrs: The picture does not show the problem (which is inside) - it will have to be lifted on a crane and the keel dropped out. There is a holding plate for a gasket to be removed and renovated as well.
I do not know whether to do some useful things whilst it is out of the water (I have a long list) or whether to sulk off somewhere and pretend it never happened. But both the surveyor and the yard have said not to worry - it will be fine. At least it is only money and at least it has been found before other damage is done. And I have seen a kestrel from the cockpit - several times.