Thanks everyone for the answers. I probably should have explained up front: I'm not motivated by virtuous ethical considerations (although I appreciate the free-trade suggestions), but I've been having problems with insomnia, I get a second wind quite late at night. I do like to have a hot drink about an hour before bed but I've started wondering if it isn't the Milo gee-ing me up. I have a lurking suspicion they have changed their formulation (to include more cocoa? or sugar?) because I vaguely remember thinking the flavour had changed.

So I'm basically wanting to road-test some alternatives so I don't have to give up my late night hot drink.

Don't be suggesting camomile tea either...that just ain't the same