Digital Music Downloads and the 'official' chart

do they all count?

[HelenDev]

Might be a bit of a UK specific answer I'm after here, but I can't seem to find this information on the net.

Wikipedia and the 'Official Chart' sites seem to say that all downloads count (not sure how this would work), but on the Amazon forum, people seem to suggest that downloads from Amazon don't count but ones from HMV do. However I can't find any official info to back this up.

Does anyone know the answer to this? I want to make sure that any tunes I buy will count towards the xmas number one!

[Shaddows]

amazon choose not to share their data, so it cannot count