The exact date the switch off will take place is yet to be confirmed by British Telecom.
However we do know that it will take place anytime between now and January 2027.
If you have a monitored intruder alarm system, it is a vital time to ensure you will not be disrupted by this upcoming switch off. You will likely have heard from your monitoring providers by now if you are affected, however if you are concerned it would be worth contacting them to ensure you system is upgraded to a new unit ASAP.