British retailer Marks & Spencer used to be best known as a pillar of the establishment.

No fiery wild-eyed radical, it would do a select number of good things for the community, and it would steadfastly refuse to beat its own drum about it. All that has changed, and the measure of just how much could be seen with the retailer's recent pronouncement that it is aiming to become the world's most sustainable retailer by 2015.

In the hands of some companies, such promises would be seen as pure rhetoric. M&S has done enough over the last three years - since it first introduced its 'Plan A' action plan - to be taken seriously.

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