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Supermarkets agree to price and discounts rules

30 November 2012 Last updated at 16:10 GMT

The Office of Fair Trading has warned leading supermarkets to observe rules on the special offers they make to customers in the run-up to Christmas.

Eight supermarkets have agreed to ensure that the offers and price promotions are fair.

They are Tesco, Sainsbury's, Morrisons, Waitrose, Marks and Spencer, Aldi, the Co-op and Lidl.

Asda, which has not yet signed up, said it was considering the revised code.

Simon Gompertz reports.