No, not fall down, as the fireplace is bricked up. But pigeons used to nest in there before DH sorted it out (it's all a bit vague).
What type of bird was it Puzzler? Was it okay? I believe that there is a classic thread on here about a seagull who fell down the chimney.
What is your favourite bird? ?
Professor Jason Arday - plagiarism etc
What sort of family would you not want to marry into?
