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Could well have been just our one then. Killing power at the CU and removing backup battery didn't stop it.
Another battery in the siren? That's what happened with mine.
Battery inside the alarm unit was knackered so any time the power went off (power cut or when we had builders in to fix a leak in the bathroom) the indoor siren would go off (there's no external siren).
I replaced the battery in the main alarm box and that stopped it going off when the main power was cut.
Even with the instructions (found on the Internet) I couldn't ever get it back to normal again as I obviously wasn't doing the right thing to clear the tamper alarm (piezo-electric thing inside the alarm box) despite having put it in maintenance mode and back out again.
We never used it anyway so I left the internal siren disconnected and it's been left in maintenance mode for the last 3+ years.
Whenever we get the flat rewired we'll get it ripped out but for now it's relatively harmless.
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Greenbank
Could well have been just our one then. Killing power at the CU and removing backup battery didn't stop it.