Just posted this in Poll Discussions by mistake - I met a neighbour earlier who was taking 18-month old back to docs because of repeated chest infection. Seems to get better then quickly starts up again (over last 8 weeks). I've noticed from the outside that there is black mould on the inside of the windows (no doubt as a result of condensation not being mopped up) and I've wondered if this could be the problem. No reason to think that there is further mould inside property, which is generally well maintained. Could this small amount be a contributory factor do you think? I'm reluctant to become involved and risk being a busybody, but if there is a chance that this may be the cause, I will mention it to her.