Very apprehensively, Finian entered the house. Thankfully nothing was amiss. Having consulted the code on the alarm he located the source of the problem.......
A spider had built a web in front of a sensor in the hallway. The vibrations caused by a trapped fly had caused the alarm to go off!
This proves that either my alarm is VERY sensitive or I am cultivating a herd of gigantic spiders.
Spent my first evening home dusting, dusting, dusting.