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Hello, I hope you are well. My name is***** am a solicitor advocate and I will be assisting you with your question today. I am very sorry to hear of the problem you are experiencing and I will do my best to help you with this matter.
The sections you include above do not make any reference to a specific agent being used.
However, the landlord may be under contract with a certain agent to only list or advertise the property with them. I would recommend speaking with your landlord first to fund out, because if he is contracted, and you find a tenant from some other source, the landlord mat have to refuse that person to avoid being in breach of contract himself.
You may be able to navigate round this by him accepting a new tenant you find. That way he would not have advertised anywhere else himself and not be in breach of any possible contract.
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