A source linked to Quaker said:
"Although a contract was not in place, the whole advert had been verbally agreed between Paula's agent and Quaker, although it was made clear that it would only go ahead if Paula won the medal”.But agent Sian Masterson said the idea was scrapped because Quaker couldn't get the script approved by the Broadcast Advertising Clearance Centre, which pre-vets commercials, because it contravened regulations.
The IPKat is sceptical of Sian Masterson’s statement and sympathises with Paula Radcliffe on the loss of a potentially lucrative product endorsement package. But never mind: here’s a tip. Win your next big race, Paula, then endorse any breakfast cereal that’s not porridge, using the slogan “I used to eat porridge, but now I’m a winner!”.
Quakers here and here
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Porridge here and here
Worse breakfasts than porridge here and here