Not knowing the overall sale price of the boat, I would probably accept the hit and move on - seeking any other remedy is likely to incur greater cost. Put it down to experience and consider sharing details of the surveyor informally with others (but not on this forum or the thread will likely...
If they can afford a QC and assistants then homelessness is likely something which can readily be avoided, even if they have to rent some bricks and mortar...
I have wondered for some time how Tally Ho is going to be supported / managed once she is sailing... some form of trustee structure or is Leo planning to keep it 'private' and raise the upkeep monies as required? maybe he has covered it and I have missed it..
Sheerness perhaps, the Medway Towns are at the other end of the Estuary, 10 miles away as the degraded munition flies, Southend on the other hand is 6 miles across open water, anyone for a small Essex tsunami? and don't forget the LNG terminal and storage on Grain :)
I wouldn't disagree with any of the examples that you give above, but your Land Rover statements re Perkins lack any factual basis, lets see some evidence.... my last post on the subject until you do
Perkins may have been a cheap but agricultural 'replacement' but LR / Rover produced the early engines, see for example Land Rover engines - Wikipedia.
In the article other suppliers of originally fitted engines are given due credit..