Which is a very fair point but as I said I am retired so the install would be fun even if it took time. Having said that, I have been messing with the existing system which was giving internal tamper alarms when not set. Have run it to ground ( I think) a bedroom PIR that had been taken off the wall by a decorator, put back loosely, and which was behind the door that the dog comes crashing through every morning. In the going, however, I seem to have gelded the outside siren and light.. One loose wire in the main box is I suspect the culprit, but not had time yet to work out where it goes. As you say, an instalkler could well have solved the whole issue in no time at all.