I bought a new cable from our local ex distributor who still has some parts here in Sydney this week. It was around AU$200. My cable was only working on one side and had seized on the other. I'm impressed that you have massaged the one you have into submission with lots of lube.
By the way I found out that the rear calipers are Jensen Interceptor as I've just had then rebuilt. The seperate hand brake pads should last for ever - unless you drive around with your hand brake on.
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