Burglar alarms

There are many types of burglar alarms on the market, ranging from DIY kits to those fitted by recognised alarm companies. Most can be fitted within a day and should not cause damage to interior decorations.
When buying a burglar alarm from a recognised company, consider the following:
Before disclosing personal security details check the address and credentials of the company and ask the representative for proof of identity.
Is the company subject to an independent inspection and, if so, by which organisation? Confirm this.
Is the alarm a requirement of your insurance company and, if so, is the company acceptable to your insurer? At the present time your insurance company may only recognise NACOSS approved alarm installers.
Ensure the representative from the alarm company offers you a list of police rules for occupiers with alarms and written confirmation that the alarm and the company are currently acceptable to the local police.
Seek written quotations from at least two alarm installers.
Does the quotation specify the installation will be to BS 4737 or BS 7042 (high security systems) or, if it is a wire free alarm, BS 6799 clause 6? Does it include the terms of maintenance and any monitoring contracts?
Does the company operate a 24 hour call-out service and offer emergency attendance within four hours?