Hi Woody,Does it?
Leaving a stack hanging out of a wall with no breast below it, should be quite worrying. And any redundant flue should be ventilated BTW.
Internal damp will react with the mortar and hasten the softening of the joints and leaning of the stack. I'm almost certain that would be in a PW surveyor's remit.
Thanks for your reply.
The stack has been removed.