Water problems in UK are not uncommon and there are many ways that it should be dealt with. I can understand that it may not be very straight forward for some to see that they have a water damage on their walls and carpets.
I can see in many houses laundry being dried in the rooms where windows are closed and it is just cold in the house, how many households have furniture close to their clod walls that simply produce moisture drops that will with time transfer to fungus and other interesting living beings.
What is best in cases like that is obvious and should be applied immediately, if it is not obvious then I will outline it for you. Do not have clod room with laundry in room. do not have furniture close to clod walls. Other then that one can always place moisture traps, they can be bought cheaply in supermarkets and those are grate inventions that will save you lots of lung conditions and money on renovation your property and simply great comfort of living.
I had same problems myself, frankly no moisture traps are bought yet. But I do certainly have my furniture farther from wall and no wet clothing in my room at any time.