2nd post this morning on the same vein. Believe you can so long as the premises are unoccupied, but don't forget security staff (if you have any) or cleaners etc, that may be in the premises during their normal duties. I'd probably want to document that decision somewhere, suggest the FRA reflects to need for security and the measures to remove those when the premises are again in-use.

What nonsense! Fire crews routinely enter known empty buildings to 'offensively' fight a fire. If this 'no entry if empty' claim were true, there would be countless commercial premises burnt out every night. Of course a dynamic risk assessment (DRA) is made by fire crews and constantly assessed. There are 1001 matters that need to be considered during such a DRA. Whether the building is empty is just one of those matters. As far as securing the empty premises, no problems. So you can brick up the building if you like, as long as you de-brick the building before it's occupied again ! The RP's control measures & safety systems (as determined by the fire risk assessment) relate only to relevant persons. Fire crews and intruders are not relevant persons so can be 'ignored' in terms of the RRO and FRA. I would ignore asking your insurers advice, unless your premises have ultra high value stock or some other type of unique scenario. As burglaries are more common over Xmas than fires, they will be only too pleased if you beef up security. A skim through your policy should confirm any such requirement.