That Thatcham rating might not be as good as you think; we used to have massive problems with Thatcham certified motorbike chains and locks, eg: https://www.youtube.com/watch?v=VC3hFr8p2ck
Pro-Tip: If you're chaining your bike up, make sure the chain can't touch the floor.
Pro-Tip: If you're chaining your bike up, make sure the chain can't touch the floor.