Hi , I have finally got rid of a nightmare tenant. However, before she left she called in the Enviromental Health Officer who basically said everything was fine but as she had been called in she would now have to get me to install mains smoke alarms. Ithought that once the old tenant moved out that would be it but she has called me to say it still needs to be done. Is this the law or just guidance as I have now gutted the house and replastered and painted etc after the previous tenant wrecked the property. Im all for safety, i have smoke alarms in almost every room in my own home but there must be another way. Can i put battery smoke alarms in each room.