Took me a few days but I have now tried these suggestions.
Cycling the power & refreshing the option screen didn't make any difference. I was still only shown the internal hard drive as the only drive I could boot from.
I just installed OS X from my original install disk onto the other partition on the external drive. This boots fine. I can be be booted from my internal drive, restart holding the option key & I get the choice to boot from either the internal or the external large partition. Still no option to boot from the smaller external partition that has the SuperDuper! clone.
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