And yes mate, they do show the wiring - it's in the dotted box to the left of the standard 110V wiring... the one marked 230V.

Ah, yeah, not my meaning, should've been clearer. They show the wiring but without specifying that they can be re-wired as is shown in the system 80 one you posted. I recall querying a "pin expert" a few years back on exactly this question, who convinced me why they couldn't be jumpered, and with my feeble understanding of AC (ie all I know is it hurts when you grab them wires! :) )I took his word for it.

Anyway, thanks for the original question Clive and great stuff Owen for the detail, makes sourcing US older Gottliebs that much more attractive.