Damp conditions encourage mould spores and dust mites — which are known causes of asthma.

And allergy to mould spores will cause trouble in autumn.

Penicillin was discovered after mould spores wafted in through a window, but the days of discovering antibiotics by chance are over.

I can almost see the mould spores mutating.

Mould spores were the biggest issue (88%), followed by creaky floorboards (64%) and incomplete work in the house (58%).