The Competition and Markets Authority has blocked the Sainsbury’s-Asda merger, claiming it would lead to increased prices.
The CMA investigation said UK shoppers would be hit by increases in stores, online and at petrol stations if the two supermarket chains were to merge.
Stuart McIntosh, chair of the inquiry group, said: “Following our in-depth investigation, we have found this deal would lead to increased prices, reduced quality and choice of products, or a poorer shopping experience for all of their UK shoppers.