(1) The holder of a category D licence must store the firearm to which the licence relates in a place in which an intruder alarm is installed.
(2) The intruder alarm must be connected to the mains power with a battery backup in case of power failure and include—
(a) a space movement detector that uses a microwave, passive infra-red, ultrasonic or similar system of detection; and
(b) an external noisemaker that sounds when the alarm is activated.