I lived in Scilly on 3 occasions when growing up. I worked on the boats as a teenager which first got me interested.
The only thing Scilly hasn't got is seawater at a civilised temperature! I live in the South of France now and the Summer sea temp in the marina gets up to 25 which for me is...
I have a gadget called a C-Tek FREE which will get a dead flat battery going in 15 minutes. It works! Be sure to get the remote version without the wires so you can use it on the boat - you can also plug it into the mains as well with another wire if you want to leave it on to condition the...