5-lever mortice lock for front door with key (Wolverton MK12)

Need to replace current front door lock. If you have an old mortice lock - the sort you turn the key right round through a full circle to lock - that would be much appreciated - we are in North MK. Thank you.

Doesn't need to look smart. 5-lever means it is the more secure sort of lock - many mortice locks are 3-lever, which we have been advised against for an external door.
Can you help with this request?
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