I need (OK, want) some white phono cables, but white seems to be
reserved either for ludicrously expensive iPod phono leads, or for
white versions of the semi-disposable 49p leads.

White versions of the kind of thing that seems to sell for between £5
and £10 online would be OK.

Who makes and sells them, if anyone?

Or alternatively, some kind of white duct for the black phono leads
would do.

Daniele