[Osem]

Mould is due to damp/humidity. The mould in the bedroom cupboard is probably due to condensation but there could be an external cause if it's on an outside wall. for example. Condensation will obviously be worse during the winter months when we tend to keep windows shut and moisture in the atmosphere builds up in our houses. Ventilation will help as would using a dehumidifier but to get the full benefit the cupboard will need to be left open and kept empty until it's dried out properly. If there is no possibility of the damp coming from an exterior source then the long term solution is to improve the ventilation in the bedroom to reduce humidity levels. Heating the space would work but, without a dehumidifier or ventilation, will only result in the condensation appearing and causing issues somewhere else.