This weekend saw the review of the wood burner in the tea room. Although the chimney never drew particularly well, it had got so bad it wasn't even worth lighting!
After removing the twin wall flue a visual inspection of the link pipe made out of 4" pipe, it was clear where the problem was. The pipe running horizontally had become completely blocked with soot and carbon deposits. After a good deal of scraping and cleaning out the fire was lit and an improvement seen immediately. Stainless flue put back and the fire was truly roaring!
Should be good to go for the New Year's Day steaming!