In reply to Denni:
Hi - that sucks.
I had the same done but only once, we live in close proximity to a rough area so they end up stealing from their doorstep so to speak (1/2 a mile or so away).
My father in law is an ex engineer and made me a dead lock for the garden shed - I also fitted a shed shackle and a Wireless PIR inside that sets off the doorbell chime (you can have extra fitted and have different chimes for different connections all wireless, it was a Siemens doorbell chime with the extra siemens PIR detector purchased from B&Q but they don't sell it anymore!)
You could also buy a garage door stopper, but that may just alert people you have something worth taking - these can be purchased from many outlets. They stop the door being opened at the bottom, but won't stop them bending the sides if they are not secured.
I also have CCTV as does the majority of my estate and have had no trouble since - it also caught a chance thief who was trying car doors at 5am. This was forwarded to the police and he was known to them so aided them.
The CCTV I have was from Maplin.
If you google shed shackle they have a kit that can be fitted to garden sheds to help reduce and beef up their security.
Just have a look at this site - I have purchased from them.
http://securityforbikes.com/shed-shackle.php
This is the beef up kit
http://securityforbikes.com/beef-up-kit.php (you can buy this stuff from a DIY store cheaper)
Post edited at 08:06