looks like the the old chubb 3G114 , beautifull lock, brass curtain and superb lever to prevent impressioning. though still picks on pin and cam with old pins.
if as i suspect, though photo is blured and dark, if the old chubb keyhole id isnt hard,
silver hammerite case, full oval cut out and distinctive brass curtain gives it away .
though that monitor lever makes a plastercine reading a bugger if the old one, strip it down its a gorgeous piece of work, nice lock to have in collection.
Wow, you UK guys are great!!! I looked at that and went DURRRR... I have no Idea. I need to start looking to Lever locks alot more these days .
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i will post some mor pics of the of inside of the lock.
al when you said only supplied with 1 hard plate you were correct as i was wondering why it was only on one side, its held in place with 2 little plastic grub screws.