Tenancy Agreement Extension Fee

(Have you heard of the long-time tenant who died and it turned out that his son had been living in the property for more than ten years without the agent realizing it, that is, he has the right to stay in a regulated rental agreement? The lawyer said it was probably not worth prosecuting the agents, as they are a national company with a lot of firepower…) We are halfway through our lease, originally by a known agent….