[snap0964]

The problem overleaf may've been a chip problem - BA's/Mondeo's use a 4D60 transponder, BF's/Focuses use a 4D63 chip.
Not sure if the AUII/III's use the same chip as the BA's - although the key's look the same.
You can get an old AU key and use a dremel to get the transponder out (careful does it) - looks like a capsule around 10mm long.