Have a go at this teaching activity, which includes a downloadable worksheet and suggested answers

Diesel prices fall 17p a litre in June.

This was the fastest monthly fall recorded since 2000. Petrol prices also fell over the same period.

Fuel prices rose steeply after the US-Iran conflict earlier in the year. Oil production and transport across the Middle East was disrupted, pushing up wholesale prices.

Crude oil is the main raw material used to make petrol and diesel, so a rise in price leads to higher costs for drivers. It is estimated that every $10 rise in the price of a barrel of oil adds around 7p to the price of a litre of fuel.

Brent crude oil rose from around $70 a barrel before the conflict to more than $120 a barrel at its height. After the US and Iran agreed to end the fighting in June, the oil price fell back to around $72 a barrel.

Wholesale prices can take up to two weeks to appear at the pump.

Average diesel prices peaked at 191.54p a litre in April, while petrol peaked at 159.53p a litre in May. Over the course of June, average diesel prices fell from 183.75p to 167.14p a litre, while petrol fell from 159.37p to 151.40p a litre.

Both prices remain well above pre-conflict levels, when petrol averaged 132p and diesel averaged 142p a litre.