The chimney is a metal tube which has a spinning top on it. It's started howling and squeaking recently but funnily enough not just when it's windy.
Anyone else had this. I've been in the house for nearly 3 years but this has only started on and off in the last month or so.
I'm assuming it's the spinning thing on top that needs replacing as all the other houses nearby have a different top on their chimney.