So you have a “5 lever” mortice lock which means you are secure and are insurance compliant, right? …Wrong! All “5 lever” means is that your lock has 5 levers inside (ok, obvious,sorry) it doesnt mean you are secure by any means and it definitely does not mean you are complying with your insurers home or business policy. What you need is 5 lever BS3621 mortice lock, with the latest 20mm bolt, the fundamental security features of these locks include the following: 5 Levers with anti pick notches, fitted with a security curtain, drill resistant hardplate, anti saw feature to bolt, fully enclosed steel boxed strike and the later versions having a 20mm bolt.
You can easily identify your current lock by inspecting the face plate, a BS lock will display the heart shaped British Standard logo, but also a good check is to turn your key with the door open and measure the length of the bolt that protrudes from the door..20mm means it is compliant with the current British Standard.
With thanks to BSI for the use of the Kitemark image.