Andrew Gabriel formulated the question :
In article ,
Harry Bloomfield writes:

It seems to have one pair (for mains input?) and what looks like around
four or five tappings from the top right of the toroid.

What picture are you looking at?

http://news.bbc.co.uk/1/hi/business/8172850.stm

By stopping the video somewhere in the middle, where it shows a close
up of the toroid and pans across to the PCB. Two windings go to the
lower + middle part of the PCB close to what looks like a PCB mount
fuse, then the four or five go to upper LH corner of the PCB via a
multi way nylon molding.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk