May be of interest:
You can have an alarm fitted, which will ring your mobile phone if activated.
Not too expensive, and can be fitted if you have electricity,
or without!
Tel: Mick 602556935

David, I fitted a similar one some time back, its worked well so far. I had to change the batteries in the sensors a bit early. I am fairly good on the DIY , fitting was at the top of the DIY scale especially calibrating/setting the system.
You could get someone to fit it. I do not know what Mick,s system and price are but I would definitely get his price and compare. I would be reluctant to fit one DIY again.