Regarding the code words Nigel Harris's book says he was monitoring them. A new list had just been introduced and there's a photo of it in there but only up to number 44, text quite faint Number 25 is New Ox/A(?)CT Pipes.

He was monitoring Caroline at the time and says his worst fears were confirmed when one of them was that the anchor chain had broken.

I'd clipped the Evening Standard report from one of my Newspaper archive sites to embed here yesterday, larger than Freddy's scan and a longer than the one on Pirate Radio Hall of Fame, later edition presumably.

20 Mar 1980, Thu Evening Standard (London, Greater London, England) Newspapers.com

Mi Amigo Sinks(2) 20 Mar 1980, Thu Evening Standard (London, Greater London, England) Newspapers.com

Also found this one on Albert Hood's trip out to see her.

Albert Hood off to see Mi Amigo 21 Mar 1980, Fri Cambridge Evening News (Cambridge, Cambridgeshire, England) Newspapers.com

Albert went out with Peter Chicago and others but saw there was no chance of salvaging anything so headed home. He took some photos which, together with a detailed account of when he heard about the sinking, is available from the Caroline webshop and has the black and white photos. One of them shows Albert and Peter on the deck of the boat they went out on with the wreck of the Mi Amigo behind them.