Maybe I should have stayed in bed.

Starter battery gave out on the boat yesterday. So today squeezed into the engine bay to take it out for replacement. So far so good (and expensive).
Crawled back into the engine bay with a very heavy battery, all fitted and tightening the last connector which decided to snap off. Two hours hunting for a replacement. Still, all done now and working on a bottle of Smokehead whisky to compensate.