Most UPVC doors use a type of lock called a Euro cylinder. I estimate less than 10% of houses in my area have BS kitemarked cylinders. The bulk of the other 90% of locks are to be frank ….. rubbish.
BS locks can also have additional ratings or certifications such as 1 to 3 stars, or the Sold Secure Diamond.
Below is a video of a high end BS cylinder. We supply and fit these Ultion locks if the customer wants one of the strongest locks available.