As average price of petrol hits 188.7p a litre, rail strike in Great Britain means many people have to drive Commuters forced to drive to work because of rail strikes are facing record costs to fill up their cars as UK fuel prices continue to rise. The average price of a litre of petrol hit 188.7p on Sunday after five weeks of relentless record prices when the price has jumped 23p from the 165.5p of mid-May.