Steel pipe...4"diam or above (Bathampton)

I was kindly given some pipe and flexi inner flue but I fear the outer pipe I have may be too rusty ...so I'm reposting...
 I am hoping that someone might have a long length (3m ish) of steel pipe that they want rid of? I'm building a chimney thing. It needs to be 4" diameter or more. It's a long shot I know but 🤞🤞🤞🤞🤞
Thankyou