Gutted for you Digsy. My guy could help but he's miles away from you down here in Notts. I'm so sorry mate, I get pi$$ed when a bird $hits on mine so I have no idea how pi$$ed you must be.
B'stards. I'm lucky enough to know a security guy who's fittend descreet cameras that are motion detecters - they only work when then sense motion. They're not that expensive either and they'd catch the motherfcu***s who did this. They relay back to your PC so when you come home you can check out what's happened. For £1000 it may be worth investing?
Anyway, sorry dude. I feel for ya. But keep your chin up.