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.