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I have a yale hsa 3500 alarm , it plugs into the phone socket and dials a phone number when the alarm is triggered. When I plug it into the phone socket it renders all of my phones dead after about 5 seconds. There is no dialling tone , I unplug the alarm and the dialling tone comes back...

I have a very old gravity fed heating system. Its a Trianco boiler but in pretty good condition for its age. I have just changed the 2 port valve on the HW return as the old one packed up after I drained the system down to fit TRV s . On the other hot water pipe coming from the boiler near...