Drivers were hit by the largest monthly spike in pump prices on record in March, despite a cut in fuel duty, according to new analysis. The RAC said the average cost of a litre of petrol at UK forecourts rose by 11.6p to end the month at 163.3p. Diesel prices rose even more sharply, up 22.1p per litre to 177.3p. The previous biggest monthly increases in average fuel prices in records dating back to 2000 were October last year for petrol (7.4p per litre) and May 2008 for diesel (8.4p per litre). Last month’s increases came despite Chancellor Rishi Sunak implementing a 5p per litre cut in fuel duty on March 23. That was worth a saving of 6p per litre owing to the impact on VAT. The RAC said the rise in pump prices was driven by surging wholesale costs caused by the war in Ukraine and drivers would …