Do you want to know if you can terminate the tenancy, or just how to go about enforcing your rights?
Sorry for the delay in replying.
You should formally write to the landlord (copying in agent) specifying the disrepair, making a list of the reasonable repair required and ask that he make those repairs within a reasonable time (eg. 14 days). State that if the landlord does not make the repair within that time you will pay to have the repairs made and will seek to claim the expense from him and are prepared to make an application to court if necessary.If the landlord does not make the repair you can pay to have it done and then write formally to him requesting the payment of the cost, again within a reasonable time). If he does not pay you can issue a claim for the money yourself through Her Majesty Courts Service's online service: http://www.moneyclaim.gov.uk/
Its pretty cheap and straightforward to use, very suitable for your purposes.
Do not withhhold rent for the cost of the repairs - you may inadvertently entitle the landlord to serve notice for possession upon you.
In a separate letter you request your certificate of registration for the deposit within 7 days or, if not (eg. if it has been lost/misplaced) then reference details of the scheme so that you can check it yourself. State that if it is not forthcoming then you are aware that you can apply to Court for the return of the deposit and fine of three times the deposit amount payable by the landlord to you and that if no information is received then you will avail yourself of this right.
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