Check your tenancy agreement for any specific wording as to repair. However, the Landlord is under a general duty to keep the property in a good state of repair and maintenance. If it is in disrepair (ie. the interior door) you should request in a letter to the Landlord that he make the repair works within a reasonable time (eg. 14 days after the date of the letter) and keep a copy.
State in the letter that if he does not complete the repair you will pay for the works yourself and seek to claim the expense from him.
If he does not carry out the works you can pay for them to be done yourself and then claim the money from him by issuing a claim through www.moneyclaim.gov.uk
Do not withhold any rent from your landlord because of this issue - you would be in breach of contract.
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