Tesco has rejected claims made by Sainsbury's that its Price Promise is "misleading".
Tesco's UK marketing director David Wood said: "Sainsbury's argument against Price Promise has been heard and rejected twice already.
"Tesco Price Promise offers customers reassurance on the price of their whole shop, in store and online, not just the big brand products.
"When family budgets are under pressure, that is the kind of help customers want and the real question for Sainsbury's is why they aren't trying to do the same for their customers."
More top news
A thoughtful teenager has taken Valentine's romance to a whole new level by buying 900 flowers and giving one to every girl in his school.
The group of Adelie penguins dwindled from 160,000 to 10,000 after an iceberg got stuck near their colony, scientists have found.
At least 10 people have been injured after more than 50 cars were involved in a pile-up on a busy highway in Pennsylvania.