My would-be landlord asked me for a work reference before I moved in and I gave him my line manager's contact details. My references were checked and I moved in. A month or so later my landlord emailed my line manager to ask a question that had nothing to do with the referencing process. The question had nothing to do with me either, it was a general question about the company. My landlord made no comment about having any connection with me when asking the question.
I told my landlord that this was an improper use of my line manager's contact details and asked him to not contact him again for private matters. My landlord argues that I should have specified that he couldn't contact my manager. This feels wrong to me as it was implied that the contact details were shared as part of and only for the referencing process.
What does the law say? This is taking place in the UK.