The pictures below are before and after the blacking and also show the state of the old anodes and the new ones.
When we brought the boat, the previous owner had told us that there was no need for a galvanic isolator, he was convinced that there was no problem. He did sound very knowledgeable, but having seen the state of the anodes (and he was not moored in a marina) I have now fitted a galvanic isolator.
Whilst Notos was out of the water I took the opportunity to remove the old name, still visible in the top photo, but removed in the picture above.