The answer to your query is as follows - which is more or less a direct lift from the current fire legisaltion.
Every employer is required to make a suitable and sufficient risk assessment of the risks to the health and safety of his employees to which they are exposed whilst they are at work. Where necessary, in order to safeguard the safety of employees, the workplace shall to the extent that is appropriate be equipped with appropriate fire fighting equipment and fire detectors and alarms.
There are of course other issues like emergency routes and exits, training, signs, lighting and maintenance, and the appointment of a competent person to assist him etc etc however the provision of any fire safety feature is directly related to the risk assessment.
There are some exceptions, but from the information you have provided the above is likely to apply. I suggest that the employer obtains a copy of "Fire Safety - An Employers Guide", available free online, and have a good read.
