Thanks Mechatrommer. The 'Gordak' unit is the intended PSU for my friend's new iron, although it seems the unit comes with the tweezers, obviously, and he must have purchased only a replacement iron. You are correct- the iron has 2 elements and 2 thermocouples and is, in effect, two irons needing a dual controller.
It looks like another job for me...
Incidentally- the second link shows an iron identical to his but with a plastic style 'sleeve' added over the pivot. It includes a MPU controlled PSU, probably with SMPS and is not a bench mounted unit but seems to dangle from the mains lead.
Regards, BT.