Always keep sheds locked, with a good quality close shackle padlock; ensure sheds are behind a secure perimeter; use dusk to dawn lighting; use hasp and staples, a padbar, or coach bolts or non-tamper screws to fasten hinges/hasps; security mark property, with your house number and post code and register your belongings at immobilise.com; fit anchor points to secure items; have a monitored alarm fitted (i.e. texting alarm), and avoid storing high value items.
Register serial numbers of tools and equipment via Immobilise https://www.immobilise.com/ and make a personal record. This will help identify items if they are found, and speed up the process of returning items to the owners.
A list of security products can be viewed via - http://www.suffolk.police.uk/sites/suffolk/files/security_product_brochure.pdf
Further advice on shed security can be obtained using the following link: http://www.suffolk.police.uk/sites/suffolk/files/shedandgaragesecurity1.pdf