Thank you for your question.
Unless the disrepair of the property is such that the property could be said to be uninhabitable then you will only be able to termainate in accordance with the terms of the AST. If you suspect it is uninhabitable then I would suggest contactin the environmental health department of your local authority. They can issue an enforcement notice and you will be able to treat that as sufficient evidence that the landlord has repudiated the AST and you can therefore terminate.
As to disrepair, issue a formal notice of disrepair on the landlord asking him to complete the specific repair works within a reasonable time (14 days), failing which you will complete them yourself and seek to claim the expense from him and are willing to issue a claim if necessary. You can issue a claim yourself through www.moneyclaim.gov.uk
If you're that desperate to get out you could of course withhold rent until the landlord serves a notice for possesion on you, though your deposit could be at risk and he will almost certainly sue you for the outstanding rent (and his costs).
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EPC's are required by regulations when a landlord rents out his property and he runs the risk of being fined for not having one, but it is not a repudiatory breach of contract that would entitle you to treat the contract as discharged. You can use it as leverage and throw your weight around a bit but he likely knows you cannot terminate because of it.
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