Retail shopping trolley

The competition regulator could be set to scrutinise allegations that UK supermarkets have duped shoppers out of hundreds of millions of pounds through misleading pricing tactics.

Consumer organisation Which? has compiled a dossier of what it calls “dodgy multi-buys, shrinking products and baffling sales offers”, and plans to send it to the Competition and Markets Authority (CMA).

The consumer group claims supermarkets are pushing illusory savings and fooling shoppers into choosing products they might not have bought if they knew the full facts.

Examples raised by Which? include Tesco flagging the “special value” of a sweetcorn sixpack when a smaller pack was proportionately cheaper, and Asda raising the individual price of a product when it was part of a multi-buy offering in order to make the deal more attractive.

Richard Lloyd, executive director at Which?, said: “Despite Which? repeatedly exposing misleading and confusing pricing tactics, and calling for voluntary change by the retailers, these dodgy offers remain on numerous supermarket shelves. Shoppers think they’re getting a bargain but in reality it’s impossible for any consumer to know if they’re genuinely getting a fair deal.

“We’re saying enough is enough, and using one of the most powerful legal weapons in our armoury to act on behalf of consumers by launching a super-complaint to the regulator. We want an end to misleading pricing tactics and for all retailers to use fair pricing that people can trust.”

About 40 per cent of groceries in Britain are currently sold on promotion, according to the retail analysts Kantar Worldpanel.

The right to make a super-complaint to the CMA or an industry regulator - which is what Which? is doing - is limited to a small number of consumer bodies such as Which? and Energywatch. Once Which? has submitted its dossier to the CMA, the regulator has 90 days to respond, and decide what action to take.