Thanks everyone for your posts. We would love to put double glazing in, but it just isn't in the budget at the moment. The condensation is on every window, but thankfully none of the walls seem damp and with the exception of the bathroom, where we've just had the flat roof overhead done, there is no evidence of condensation/mould either. From your posts, it seems like laundry is the cause, as we seem to have it on the go all the time, so getting a dehumidifier seems like our best option - any recommendations?