On Tue, 27 Jun 2006 19:49:27 +0100 (BST), Dave Liquorice wrote:

"Cocoa powder" as bought in the shops to make chocolate drinks is a
mixture of dried milk, sugar and a bit of cocoa.

You appear to be mistaking "drinking chocolate" for cocoa powder. Cocoa
powder is de-fatted solids of cocoa, because the cocoa is acid it may be
neutralised with alkali which some think improves the flavour. This is
typical of Dutch cocoa powder such as Van Houtens.