Dear Barry, I am a relatively new landlord (2 years in) in Belfast. I've been pretty lucky in that I've had great tenants, but a recurring problem in the property is mould on ceilings. The house is relatively old but has been fully refurbed (including a damp proof course - so I know it's not damp at least!) and the place was freshly repainted before my first tenants moved in. They assure me, and I believe them, that they are opening windows regularly and there is an extractor fan in the bathroom. Yet we have instances of mould on the bedroom ceilings and walls - not loads, but enough to look unsightly for a house freshly painted 2 years ago! What can I do to further ensure the house stays mould free during the next tenancy? Thanks in advance, Tighearnan.