I offer a full service to landlords and letting agents with maintenance of properties with a prompt call out service and getting installations to comply with current regulations.The wiring should be checked every five years if a property is let. This is done by a electrical inspection and producing a electrical condition report,which is done in a PDF format so copies can sent to letting agents and insurance companies if required .I always advise main operated smoke alarms to be fitted on all floors of rental properties ,the models I install have a battery back up and are interlinked which means if smoke is detected all the alarms in that circuit will sound