Diesel prices fell by a record of nearly 12p a litre last month, figures show.
The RAC said the average price of the fuel at UK forecourts dropped from 158.9p to 147p in May.
Diesel prices fell by a record of nearly 12p a litre last month, figures show.
The RAC said the average price of the fuel at UK forecourts dropped from 158.9p to 147p in May.