In answer to ‘was it a 'self-fit-out' boat or was it built and fitted out by a boat builder ?’ Its an Aqualine Manhattan.
In its life it’s had a water pump leak, a calorifier leak and a leak in the bathroom.
The bathroom one ended up with about 200 litres of water under the floor, thanks to a dodgy bilge pump. That was around 2 months ago.
I have heard that large quantities of water can take a long time to filter down to the bilge at the stern especially with concrete blocks. But I’d have thought by now it would have drained to the stern?
what do you think? Thanks for all your advice. It’s very helpful.