UK Property Law
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The key issue here is whether or not the property was unfit for human habitation or not.
If a reasonable person would consider that it was unfit for human habitation then this would be a repudiatory breach of contract. This is a breach of contract so serious that it goes to the root of the contract and denies the other party substantially the whole of the benefit of the contract.
If it was unfit and therefore a repudiatory breach of contract then you could terminate immediately.
As this would be a breach by the landord/agent you woudl also be entitled to be compensated for the breach. You would be able to to claim damages from them for teh direct financial loss that you have suffered.
IN the circumstances I presume that you simply want out and not have to pay any money. I would therefore play hardball with them. State in writing to them that you consider it a repudiatory breach of contract (if you do) and state that you consider you are entitled to terminate on the basis of their breach.
State that you only wish to deal with the matter in writing now. State that you are not minded to pursue them for damages but that if they persist in attempting to claim from you then you will sue them in county cour tfor the repudiatory breach.
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