>>Question: is this Doctor Who canon, or is this background of
>>your own devising?
>
>I believe it is, in fact, canon, but cannot cite sources at the
>present time, as most of my Who materials are still MIA from my
>most recent move.

I direct your attention to http://www.bbc.co.uk/cult/doctorwho/alien/cybermen.shtml - being a BBC creation, I think we can mark it as 'official'.

--
Geoff Depew - Mephron
Haberdasher to Androids, Malakite of Lightning and Angel of Tech Support Professionals
(They won't give me LARTs, they say that's restricted to Michael.)