Thanks for your question.
Obviously, renting a flat that is uninhabitable for human occupation is a fundamental breach of contract by the agent/landlord which entitles you to treat the contract as at an end. The difficulty is being able to produce evidence to back this up.
Contact the local authority's environmental department and ask them to make an emergency inspection, if they find it uninhabitable they will declare it as such and issue an enforcement notice against the landlord. Ask for a statement in writing and you can then terminate on the strength of this evidence.
At the same time write to the landlord stating the problem and that you believe it to be uninhabitable at present and request that she instructs a professional to deal with the problem no later than 7 days from the date of the letter failing which you will instruct and pay for one and then seek to claim the expense from them by an application to Court.
You can then reclaim the expense from www.moneyclaim.gov.uk
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The agents stand in the place of the landlord in this matter, though I would certainly copy both landlord and agent in all correspondence relating to this issue. It's plainly irresponsible and unethical to let a property in the state it's presently in, but you have rights to compel them to make it habitable (as explained above).
If the breach is proved then you can claim for financial loss resulting from the breach, the difficult with the stress you are suffering is that it's not easy to put a financial figure on it and therefore harder to claim and infinitely harder to prove.
You can complain to the Association of Residential Lettings Agents about their conduct if you so wish.
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