British Standard Euro Locksets are a range of lock cases that come complete with bolt through security escutcheons, box keeps, fixings and 6 pin Euro cylinders. The range includes Sashlocks, deadlocks and escape locks. They all conform to BS3621 and are recommended for use on front doors.
Lockcases when tested together with a cylinder can meet BS3621:2007. Replacing the cylinder or fitting a rebate set, however will technically invalidate the locks compliance with this standard. In addition egress versions are available to meet BS 8621:2004.