The tenant initially had a 2 year 11 month lease, many years ago. When this expired he just continued his business there, and paid his rent on a monthly basis....sometimes a month or two in arrears, but he continues to pay it.
He is refusing to pay any increase in rent over the years, to cover inflation / rising property values / rising cost of living etc....despite many meetings and solicitors letters since last year. He was also often unco-operative in relation to other matters eg parking, trespass etc , but has now toed the line more or less after many warnings over this. The landlord would however be happy to see him leave as he could get a more realistic 21st century rent from another tenant.