The Fire Safety Order 2005 in respect of PORTABLE FIRE-FIGHTING EQUIPMENT says the following....
Fire-fighting and fire detection
(1) Where necessary (whether due to the features of the premises, the activity carried on there, any hazard present or any other relevant circumstances) in order to safeguard the safety of relevant persons, the responsible person must ensure that--
(a) the premises are, to the extent that it is appropriate, equipped with appropriate fire-fighting equipment and with fire detectors and alarms; and
(b) any non-automatic fire-fighting equipment so provided is easily accessible, simple to use and indicated by signs