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Verisure are pretty good from what I hear (though my business works with them)
Canary and Nest would be options as well, for the cheaper and easier setup options.
I've got some of those magic ink stickers to put on the front door and we're getting a couple of Canary bits.
But also what @Fox says, just make your house un-appealing. http://www.wired.com/2016/07/nest-cam-outdoor/
Tenderloin-
Canary the all-in-one box? http://www.johnlewis.com/canary-all-in-one-security-system/p2263102?sku=234832815&s_kwcid=2dx92700012702402042&tmad=c&tmcampid=2&gclid=CPmU-s6T8M4CFYcLcgodsn8IMg&gclsrc=ds looks good and reasonably cheap/free plans.
What are the stickers? We have some smart water ones up (and stuff is marked) which apparently didn't help.
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We now have a Canary, it's 'fun' watching the cats do fuckall all day but it's not a serious tool - the motion detection is far too sensitive and apparently not currently learning (I was getting notifications every time a bus went past and altered the light coming into the room).
Also have a pair of outdoor IP cameras to install in the back garden (with HD and cloud backup) and a wireless Yale alarm which has reasonable reviews. Hopefully it isn't quite so trigger-happy regarding cats and sunbeams. Still works out cheaper than a year of Verisure!
Dramatic_Hammer
That's why having a security guard turn up and have a poke around seems like a good idea. I'm not sure what else we can do to secure the windows other than this sort of thing:
but they don't seem like they'd stop much more than the snapped and bent lock keeps already did.