https://www.thekeylab.co.uk/van-security/
L4V Hook Deadlocks L4V hook deadlocks are an upgrade to front and side van doors, as well as tailgates and cab doors. They operate independently of the locking system and are secured using a high-security keys. Specially designed to ward off attacks of 'peel and steal' this product has been tested independently increasing resistance by up to 300 percent. It is perfect for multi-drop couriers and applications where the driver might not lock the door of their vehicle. Hook Deadlock A Hook Deadlock is an extra lock that can be attached to the door