Security is one of the key considerations for any shedworker. One of the experts in the field is Gardien Garden Security, an internet-based company who also run English Garden Antiques and have considerable experience in the field (their security director Mick Gains has decades of experience as a police officer and has been awarded the Queen's Police Medal for services to Crime Prevention). There's plenty of information on the site about shed security, insurance and even a consultancy service. Well worth a browse.
Via Enterprise Nation