Hi all, update on our problems with our Seahawk in France,
myself and a very nice Dutch mechanic have managed to change the stern gland while in the French Canal, very large bilge pump and the two of us working together managed to check, clean and replace the gland very successfully, still wouldn't recommend doing it this way unless completely necessary.
Heat exchanger I replaced, managed to find a new one online (made in Italy) no more leaks and engine running beautifully, thanks for all of your advice everyone, now on our way to Strasbourg.