Clayton Dubilier & Rice LLC has been given five days to address competition concerns in its 7 billion pound ($9.2 billion) purchase of British grocer Wm Morrison Supermarkets Plc or it will face an in-depth probe from the U.K.’s watchdog.

The Competition and Markets Authority said the deal could lead to higher fuel prices in 121 locations where both firms own forecourts, according to a statement. CD&R has five working days to offer proposals, they said in a statement. The regulator then has a further five days to accept the offer to refer the deal to an in-depth investigation.

“Prices for petrol and diesel have recently hit record highs, which makes it even more important that we don’t allow a lack of competition at the pump to make the situation worse,” Colin Raftery, senior director of mergers at the CMA, said.

“CD&R looks forward to continuing to work constructively with the CMA,” the firm said. A spokesperson for Morrison declined to comment.

CD&R won a rare auction for the supermarket in an intense battle against private equity rival Fortress Investment Group last year. The deal is one of Britain’s biggest ever take-private deals.

This is not the first time the CMA has raised concerns about gas price competitiveness in the U.K. supermarket sector. When Walmart Inc. sold a majority stake in Asda to the Issa brothers and TDR Capital, the antitrust regulator identified 36 locations where it was worried that fuel prices could rise. The sale only went through after the consortium agreed to sell 27 gas stations.

Asda was previously blocked from merging with bigger rival J Sainsbury Plc in 2019 after the regulator said the combination would lead to increased prices in stores, online and at many gas stations across the U.K.

Petrol and diesel prices in Britain have been at record highs in recent weeks and Chancellor Rishi Sunak cut fuel duty for the first time in over a decade in a bid to try and lessen the pain for motorists. Asda and Sainsbury have already cut their fuel prices and Morrison has said it intends to pass on the 5 pence duty cut to customers.