Sainsbury’s is to buy 18 petrol stations from Rontec Investments, the company that acquired Total UK’s estate last year.

The deal, which is subject to approval from the Office of Fair Trading, includes seven Total UK sites in London, as well as sites in the Midlands, Southampton and Lincolnshire.

According to The Grocer’s Grocery Retail Structure, published last year, Sainsbury’s has 260 forecourts attached to its larger supermarkets. It also started a joint venture with Shell in 2003, but this has since been discontinued.

The OFT said it was considering whether the deal would result in a substantial lessening of competition in the UK fuel market.

Rontec, the parent company of Top 50 indie Snax 24, acquired 810 Total UK sites last year but agreed to sell 251 forecourts to Shell UK and 318 sites to DCC.