You should have a tenancy agreement which lists the rights and responsibilities of both sides. If you have reported the faults and he has not acted on them you can take him to court and sue him. Alternatively you are entitled to withhold the rent in order to have the repairs done. You should also report the matter to the local council. They can force the landlord to do the repairs or they can do them themselves and charge him (or her).
You can get further information from the Department of the Environment, Transport and the Regions. Look
here
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Save Chip - Don't let Sarah win!
Official Titterer of the Laughing Hyenas
Don't mention the score - I mentioned it once but I think I got away with it!