The new house has four doors with matching locks. I'm not sure of the terminology, but I think they're a combined latch (the sprung bolt that withdraws from the plate in the door-frame when the handle is turned) and a deadbolt operated by a key. Thus any of the four doors can be (un)locked by the same key. Very handy, until you lose the key, but I'm not going to worry about that.
Unfortunately, the locks are only 3-lever locks and I'd really like
5-lever locks (as would my insurers, no doubt).So, where might I buy a set of such locks that all use the same key?
James