I live in a two storey block of 4 flats that suffer from a condensation nightmare. The inside of the windows are invariably covered in moisture and the sills have water on them most of the time. The flats are 30 years old. Obviously I could leave the windows wide open, but that won't be a great option during the winter. I could have the windows replaced with ones that are vented, but that would cost mega bucks, and I'm not sure that it would resolve the problem. Can anyone recommend a local company (BN1) that specialise in resolving a problem of this nature?