Before signing a contract with them please review the term and conditions carefully. The wording is deceiving and not clear. In my case my tenants gave their notice early in the contract. I am not re-letting but am selling the property but Black Katz are refusing to refund the commission pro rata but "as a gesture of goodwill they will issue a credit note to be used by family or friends on any property at any time now or in the future" as they say. Translated into plain English that means "tough, you will lose the money".
Not to recommend.