just also had a look at the PIR photo!!!
boy, are they old ones!!!
if you can afford it, get them changed for modern ones,
they look like single shot PIR detectors, no pulse count, or anything else!!!
and you have a reasonble new panel???
did the installing company suggest that you had them changed???
they should have done!!!
the new ones will look much nicer in you newly decorated house as well!!
Oasis
Thanks for that. Yes, they are probably 20 years old, from my previous alarm installation. The panel is just over a year old and the engineer said as long as I was happy that the sensors worked, leave them be.
Looks like I need to spend money, but new sensors won't solve my decorating problem. I am due to decorate another room in a couple of months so will presumably have same problem. Will speak to installers today
Thanks again for reply.