In reply to poppy-cock:
J218 is absolutely right in terms of what’s going on with the flat, sounds like they have seen the opportunity to get another flats worth of income out of the building, but just bodged it, i.e. not tanked it or put a membrane in plus no insulation so cold walls humid air = condensation.
We have been on the receiving end of things like this with properties we manage. Sometimes it can be cured fairly easily if and we have arranged to put people up in a hotel for a week while work is carried out and arranged for compensation. This however sounds like a full hit, and you are not going to be out of the flat for a week while they knock off a bit of plaster/dam proof and make good.
If you want out, get the environmental health in to assess the problem. If it is as bad as you say they will deem it uninhabitable and will issue a notice to the Landlord to carry out and complete works within 14 to 28 days (can’t remember) if they do not they will organise a contractor to do it and bill the landlord usually at an extortionate price that your landlord will not want to pay. This is a legal notice and they will be on your landlords’ case two days after the notice is issued to see whether they have arranged for works to commence. They will also fight your side as to what you are supposed to do while the works are carried out. Seeing as the problem is so extensive you will clearly need to be re-housed for several weeks, therefore the landlord will have no option but to release you from your contract, if there is a problem with the deposit scream blue murder with a solicitors letter, inform environmental health and get your man from the CAB to give them a call. Chances are they will just pay up so you go away rather than take the risk of court action, damages, money towards expenses incurred moving to a new home which you will be awarded if it goes to court.
Hope this helps
I would like to point out that although I have been in the Landlords position in situations like this I am not a scum bag landlord. I am the person/company in the middle who gets shouted at from both sides and has to sort it out. You are in the right here and any sensible landlord will hold his hand in the air, help find you a new flat and assist in the move, and get the flat sorted out. Unfortunately they are not that common; when people become landlords they take on an “I am god” attitude and become so tight that if you crammed a lump of coal up their arse you would have a diamond in a week.