The consumer group Which? has accused Tesco of "breaking the law" with its Clubcard price promotions.
Which? has reported the supermarket chain to the Competition and Markets Authority (CMA) claiming that it does not provide detailed pricing information on its loyalty card offers.
The concerns are around the supermarket's unit pricing both in-store and online - this is the small print on shelf prices which gives the price per 100g or 100ml.
