Series 3 were different keys for ignition, doors and tailgate - only common keying was the two doors (Same incidentally applies to my 1986 110!).
It is unlikely that the rear door (tailgate) can be common keyed with the doors, although this is possible, since the the cylinders are about the same size, although they are certain to be different profiles, and probably different brand locks.
It is almost certain that these cannot be common keyed with the ignition, which is a much larger key and cylinder, needed to operate the steering lock (I assume it has a steering lock at that date).
The tailgate handle probably is literally a garage door handle - part of the Australian content, and this type of handle, first appearing on car doors in the 1920s, was adopted by garage door manufacturers after car manufacturers stopped using generic door handles.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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