Intruder alarms are the typical basis of security systems for most businesses. Typically, an insurer would require an correctly installed intruder alarm system for any policy taken out for a business property.
This makes it essential for you to use an installer who has been approved by the NSI (National Security Inspectorate, previously known as NACOSS).
This independent inspectorate is recognised by the insurance industry as well as recommended by the Police. An alarm which is not installed by an NSI approved engineer would not be accepted by an insurer.
If you replace your intruder alarm system you need to be sure that it is to the required standard demanded by your policy or you could have any claims you make rejected. Some insurers even require that any maintenance or servicing is carried out by NSI approved companies.