NoTimeToFly

Hi I have recently moved into a property in Scotland which seems to have one of these. It was marketed as being non- operational and essentially isn’t. No control panel, PIRs or evidence of a system apart from a few old door contact switches on the conservatory and garage door, but, the main panel under the stairs as in this photo is present and is still clicking away, chirping and in the evenings sounds like a siren is being emitted. It’s not an actual loud sound. It’s as if another house has an alarm activated a few streets away. It’s very quiet but I heard it almost straight away in the kitchen when moving in and thought it was one of the kids toys in a box somewhere. The previous owner states it was de-activated c1995 when she moved into the house. But it’s clearly still plumbed in and chirping away. What should I do with it?