How often should we run evacuation drills?
For most workplaces the accepted practice is at least annually, and more often where the risk or the occupancy changes — new staff, layout changes, or a premises with vulnerable occupants. Your fire risk assessment should set the frequency, and Gaffer keeps the dates so you can show you met it.
What makes a drill record useful in an inspection?
Specifics. A date, who was present, how long the evacuation took and what problems were found. A record that says only 'drill completed' is very hard to rely on if anything is ever questioned.
Can we record drills for customer premises as well as our own?
Yes. Drills are recorded against a site, so if you manage or maintain premises on behalf of a customer, the record sits with that site alongside its other compliance documents.
Does this connect to the fire risk assessment?
Yes. The fire risk assessment records whether drills are conducted and the date of the last one, and drill records are what those fields reflect.