What volumes of cocoa are involved?

Mars spokesperson:

It’s our policy not to discuss commercial contracts, however, from 2010 over 160 million bars of Galaxy chocolate, the equivalent of all the Easter Eggs purchased in the run up to Easter in the UK, will carry the Rainforest Alliance certification in the UK & Ireland. 
Cadbury spokesperson:

This ground-breaking move will result in the tripling of sales of cocoa under Fairtrade terms for cocoa farmers in Ghana from 5,000 to 15,000 tonnes in 2010, both increasing Fairtrade cocoa sales for existing certified farming groups, as well as opening up new opportunities for thousands more farmers to benefit from the Fairtrade system. 40,000 farmers will benefit immediately and this will rise to 1 million farmers over the next ten years.

Overall this increases Fairtrade sales in the UK by 25%, compared to 2008.

What about the other commodities in these products, in particular the sugar?

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