Warning of new rules for Aldi and Lidl after watchdog review

The Competition and Markets Authority (CMA) has provisionally decided that both discounters should be added to the Groceries Market Investigation (Controlled Land) Order 2010, which currently applies to Asda, Co-op, Marks and Spencer, Morrisons, Sainsbury’s, Tesco, and Waitrose.

This order is designed to prevent large grocery retailers from using land agreements to block competitors from opening nearby stores, often through restrictive covenants or exclusivity terms.

Juliette Enser, executive director of competition enforcement and markets at the CMA, said: “We want everyone to have the best choice of supermarket and range of prices when buying their groceries.

“To ensure this happens, we put rules in place to prevent big supermarket chains blocking rival stores from opening nearby – and now we propose applying those rules to Aldi and Lidl too.

“This is about allowing shoppers to choose where they spend their money and levelling the playing field for all major supermarkets.

“Today’s proposals are provisional and we welcome views before deciding the best way forward.”

The CMA’s review found that Aldi, Lidl GB, and Lidl NI now meet the criteria of ‘Large Grocery Retailers’ (LGRs) due to their store footprint, nationwide presence, procurement model, and the breadth of their grocery range.

Aldi and Lidl were originally excluded from the 2010 order as ‘limited assortment discounters’, offering a smaller selection of products compared to traditional supermarkets.

However, the CMA’s provisional findings indicate that this is no longer the case.

All three now operate large grocery stores, each with more than 1,000 square metres of shop floor space, and offer a full range of products, though with less category choice than some competitors.

They also purchase goods directly from suppliers through integrated wholesaling.

With the UK grocery market estimated to be worth £215 billion, Aldi and Lidl are now ranked among the top five retailers by market share.

The CMA is seeking feedback from stakeholders before reaching a final decision.

Aldi and Lidl could join the other supermarket chains later this year.

The CMA is inviting views until 5pm on Monday, September 7, 2026, and will issue its final decision in the autumn after reviewing responses.

If the discounters are included under the order, they will be prevented from using land agreements to limit competition from other supermarket chains.

The CMA aims to ensure competition across the grocery sector to give shoppers more choice and competitive pricing by removing obstacles to new store openings.