In article .com, pjh1
@tesco.net says...
Hi! I want to put a lock on my back gate. I want for it to be keyed
with a 'yale' style key (whatever the correct name for that is). I
need for it to be lockable/openable from both sides. Now, here come the
curve balls...

The backset of the lock needs to be greater than 65mm preferably more
though, to be fair 100mm would be enough :-)

Because this is just a gate (and the 'Z' frame is only about 1" think)
it will be difficult to fit a standard mortice lock. So I'm thinking
that a rim lock may be best - or, at least, quite a thin lock.

Because I don't want to carry a chunking great chubb key around just
for my back gate, I'm thinking that a suitable new fangled euro lock
may be available

If possible, the lock would also have a normal handle for opening the
gate too (does this make it a 'sash lock'?).

Any ideas out there?

As nobody seems to have any good ideas here's mine:

Mount a Euro mortice lock on the back of the gate not on the frame,
boxed in with a bit of 12mm ply and a few strips of wood of suitable
thickness. Rather than slotting into the gatepost the latch bears on
the end of a sliding bolt, which can be moved from either side of the
gate using a pin that slides in a slot (cut in the gate on the front,
and the 12mm ply on the back). Thus when the mortice lock is open the
bolt may be slid open or closed, but when the mortice lock is closed it
holds the bolt closed.