Ground anchors like the Torc are fantastic if you've got a bit of hard standing to drill into, but what if your shed's on decking or earth? Well, the Shed Shackle is the next best thing. You get a hardened, powder coated steel shackle and two long plates, plus a short one, and the bits go together to form just about the most secure option available to anyone without a proper floor.
It's all very well locking your bikes up in the shed, but much better if you've got something secure to lock them to. The Torc Ground anchor has been around for a while and gained high praise; the new Series II is a simpler design that's easy to fit with standard DIY tools, and will make the basis of an excellent shed or garage security system. It's a bit cheaper than the last one as well!