The ad, which features two naked black bodies evolving from a lump of flesh as they revolve on a potter's wheel, was created by Red's agency Mother and shot by Glazer.
According to sources, the spot was due to run in September this year. Mother believes the ad will air in 2007, but sources close to the charity say that Motorola has proclaimed that the execution will "never see the light of day".
If the ad fails to appear, the initiative will have wasted hundreds of thousands of pounds.
Red was launched in January this year with backing from global brands such as American Express and Gap; Motorola signed up in May. Motorola declined to comment.
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