Interesting point. There's been a DPA discussion already today.
In this case, the tenancy details have absolutely no right to be online. The terms of the agreement, yes, but your details, and absolute no.
Get hold of the administrators and have them remove it immediately. You can also contact the Data Protection folk https://www.ico.gov.uk/Global/contact_us.aspx for advice and enforcement.
Anyone buying a property with a view to letting would only need to know that you have an agreemant and how much return they can expect for the investment. Sloppy work by the agent.
I may be a housing professional but my views, thoughts, opinions, advice, criticisms or otherwise on this board are mine and are not representative of my company, colleagues, managers. I am here as an independent human being who simply wants to learn new stuff, share ideas and interact with like minded people.