UK supermarkets cut diesel prices by 7p a litre after watchdog concerns

Reduction follows CMA plans to grill executives about sustained higher margins' but RAC says retailers should go further

Supermarkets have cut more than 7p a litre from the price of diesel since the UK's competition watchdog warned it would question retail bosses about unnecessarily high forecourt prices, according to the RAC.

The motoring group found that the average price of diesel fell by 7.44p a litre, from 151.02p two weeks ago to 143.58p this week, after the Competition and Markets Authority (CMA) raised concerns that retailers were making sustained higher margins" from sales of diesel.