However, if you have to find the legal rental terms and conditions, you can readrental laws (in the UK), at Plaza Estates website, which should help put you in the right direction as far as property is concerned.
I was recently looking for a home on rent in London, I came across Plaza Estates, and deployed them as my agents, because I did not want to go about the search on my own. I signed an agreement with them and paid them a 2% commission fee.
Perhaps all parties can work in concert together resolve issues.
In response to your query JR, I had made an offer of Â£800k to the landlord, which he had accepted. This was communicated to me by the estate agent, who also told me that I am to pay him fees of 1.75% on top of the agreed sum. I did not have any agreement with the agent and always thought that the seller would bear the cost of the estate agents fee as he has an agreement with the agent to sell the property. In my tenancy agreement there is no clause about myself bearing the cost of any agency fee in the event of a sale.
This is not to be considered legal advice, but normally with the sale of a home the "seller" is responsible for paying any "professional service fees" (commission).
Since the owner may be trying to pass this expense to you, we recommend having a conversation with them to clarify your concern.
Consult a real estate attorney for the best source of information on legal affairs.