Alexandra Locksmiths have recently fitted an Era auto dead locking rim lock night latch in Muswell Hill, London N10.
The Era 1930 (60mm backset) and 1830 (40mm backset) Auto-deadlocking Rim Lock/Nightlatch complies with the British Standard BS3621 : 2004 and with the new European Standard (BSEN 12209). It is ideally suited to glass panelled doors as not only is it Auto-deadlocking, meaning it cannot be slipped open when the door is closed from the outside but you can also deadlock the handle with the same key that works the cylinder from the outside, this is done with the door open insert the key into the keyway in the handle, turn one full rotation, remove the key, test the handle, it should not move, leave the property and close the door and lock your 5 lever British Standard deadlock, which should be fitted on the lower third of the door.
The benefit of locking the handle is if anybody gains entry through a small window they have two locks to get open on the front door meaning they have to go back out the way they came, which limits the amount they can carry out of the property.
The lock comes in Polished Brass, Polished Chrome and Satin Chrome with both the standard 40mm and 60mm backset. (The backset is the distance from the edge of the door to the centre of the keyhole/cylinder on the outside).