Started wearing long sleeves in the house, even a thick fleece following a cold that has left me feeling cold when I shouldn't.
So we put heating on tonight but mostly to check it's OK as we had a problem last year and it didn't go on at first. It's OK so we kept it on a few hours to be sure then it's off and hopefully off for a bit longer.
Always good to check before it gets cold in case there's a problem. That way you can get a plumber in before they get busy with the first cold weather / hard frost.