Had trouble getting into the car this morning because all the doors were frozen shut, and the ice scraper wouldn't shift the hard ice on the windows. Still started up and ran OK though!
Given I'm not yet ready with the installation of the bio plant I can see me ending up on diesel...

Annoyingly having just repainted the steel storage tank in the picture above, ready to install - it frosted overnight, so I'm hoping the paint cured enough before the ice settled on it...