If you're referring to home heating oil, prices have been rising for much of the year. They're currently up about 28% from the start of the year, with the trend still being steeply upwards:
https://www.boilerjuice.com/heating-oil-prices/
We are with Northern Energy, just looked on my account and its gone up from 0.55p a liter to 0.62p which means around £70 more than last fill up which was in May. Not as bad as I thought, hopefully things will have settled down by the time we need another fill up in January.