There are certain risks and responsibilities to being a landlord in the UK. Any property you let must be safe and free health hazards.
Gas equipment: must be safely installed and maintained by a Gas Safe registered engineer; have a gas safety check annually.
Electrical system is safe, including all appliances you supply the tenant.
Fire safety regulations must be obeyed; provide a smoke alarm for each storey of the property; escape routes and; provide fire alarms and extinguishers if necessary.