Weetabix is running a £1m cash prize giveaway across its key brands.

Consumers must enter a unique code found on the inside of cereal boxes onto a website to be in with a chance of winning prizes, which range from £10 to £100,000. The 10-week on-pack promotion will appear on brands including Weetabix, Oatibix and Ready Brek from September.

"As the promotion will be in store for 10 weeks we expect to generate additional repeat purchase as shoppers look to play again," said a spokesman.