As Dom says get a Alarm box/system or even a false one - I'm sure you can get these somewhere..and if your looking over your property for security: look at it from the lowly'est scumbag viewpoint that you can.
Thats if this 'id look at you home security mate' post is to be believed.
Im not that convinced about this though...they're more likely to be bothered with how they can fleece you and anyone else rather than exact details.
Though you'd think the delivery address of the goods that where bought on your card Paul, would/could be researched - i'd like toknow esp.if I was in your position.
MisterPaul: you gave us a good idea on the purchase online thing ie credit card over debit card.