Asda, Tesco, Poundland and Home Bargains sold knives to underage children at least 15 times, National Trading Standards has claimed.
A proposed merger between Sainsbury's and Asda has been blocked over fears it would result in higher prices for consumers.
The supermarket giant has announced it will no longer sell single kitchen knives by the end of April this year.
Earlier this month, Irish cheesemaker Ornua admitted that it had begun stockpiling cheddar in the UK to protect the company against price rises if the UK left the European Union without a deal.
Sainsbury’s and Asda have been warned by the competition watchdog that nearly 500 of their supermarkets overlap following initial investigations into the £12 billion tie-up.
The alleged incident took place in a supermarket when the 18-year-old was trying to pay for her shopping
Amy Platt decided to take action after being infuriated by 'Future Scientist' and 'Daddy's Little Girl' t-shirts at her local store
Andrew Joret spoke to Paul Ross and Carole Malone about the egg contamination scare, after produce from the Netherlands was found to be tainted with a pesticide.
A number of eggs from the Netherlands are thought to be contaminated with the insecticide Fibronil
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A survey by Lloyds Bank has revealed that having a supermarket close to your house can put thousands on the asking price. But which store makes the biggest difference?