What must be recorded, how long to retain records, and what format works best.
The fire safety log book is the primary evidence of your fire safety management. It must record: weekly fire alarm tests, monthly emergency lighting tests, all fire drills (date, time, who participated, evacuation time, learning points), all fire alarm activations (cause, time taken to reset), false alarm history, all maintenance visits (contractor, system serviced, certificate number), and any defects found and remedial action taken.
Retain fire safety records for a minimum of three years. If there has ever been a fire or injury, retain indefinitely. In practice, many providers retain digitally for the life of the building.
A physical log book is traditional and readily available during inspection, but a digital system is acceptable provided it is accessible on-site during a visit. Whatever format you use, it must be up to date at the point of inspection -- backdating records is fraud.
CareHomeDesk gives you compliance checklists, maintenance logs, and contractor management tools built around exactly this kind of knowledge.