When we were deciding this we went for
https://www.locksonline.co.uk/Era-British-Standard-BS8621-Euro-Dead-Locks.html
And
https://www.locksonline.co.uk/ERA-1530-BS8621-2004-Auto-Deadlocking-Escape-Narrow-Style-Nightlatch.html
They will key them alike too. I really couldn't see what extra £750 got you.
@rj started
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When we were deciding this we went for
https://www.locksonline.co.uk/Era-British-Standard-BS8621-Euro-Dead-Locks.html
And
https://www.locksonline.co.uk/ERA-1530-BS8621-2004-Auto-Deadlocking-Escape-Narrow-Style-Nightlatch.html
They will key them alike too. I really couldn't see what extra £750 got you.