Catching up with the victims and villains of the housing rental market. Rachel intended to rent out her Snowdonia cottage for only three months. Four years later her tenant is still there and not paying any rent. Plus, the stories of Stevenage landlord Derek, whose tenant Kellie proved so troublesome that the police had to be called, and Claud from south London, who was left £30,000 in debt when a professional couple split up