SolvedVRDP08300 | Alarm call systems [Items 19 and 20]: services performed by control centres operating alarm systems [Item 20]
From HM Revenue & Customs · VAT Relief for Disabled People Manual
A business which qualifies as a specified person or control centre as explained in VRDP08200 can zero-rate the supply of any services necessarily performed in receiving and responding to calls from the alarm system.
The services do not necessarily have to be supplied directly to a disabled person, provided that the call originated from a disabled person.