Might also be worth looking into installing some lights on a timer in your property as a deterrent when you're away. A house with curtains drawn and lights out is always going to be more attractive for any potential burglar! I read an article (http://www.hertsad.co.uk/property/the_leafy_suburbs_of_st_albans_may_seem_safe_but_what_should_you_do_if_you_re_burgled_1_4447524) that suggested visual security items are often the most effective. In fact, on another forum there was a guy who had kept his burglar alarm installed on the front of his property for years without ever replacing the batteries. He'd never been burgled....possibly by luck rather than judgement though!