Oil cost falls below $28 a barrel, or less than the price of an actual barrel

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Not everyone agreed with the RAC when it said that petrol could become cheaper than bottled water.

RAC wagered that if the price of oil slid below $20 barrel, it could push petrol prices to 90p a litre - while a fall to $10 a barrel or less could see petrol sold at 86p a litre, or cheaper than a bottle of water.

But only if you are a water snob, according to the Hydration Council, who emailed us to say that the average price of a litre bottle of water, purchased in a multi-pack, is 38p. Take that, Perrier drinkers.

The oil price has continued to slide after the lifting of economic sanctions against Iran. The newly liberated country is expected to pump fresh reserves of oil into an already oversupplied market, making oil even cheaper.

On Monday, the price of a barrel of Brent Crude dropped below $28 and Twitter started fighting over things that are more expensive than a barrel of oil, including a barrel.

To, inevitably, booze. A native Londoner writes:

He might be advised to stick to the barrel of oil.

Falling oil prices probably won't do much to the price of pizza and beer, sadly. But it might benefit drivers - just as long as savings get passed on at the pump.

RAC said that there was scope for retailers to cut prices by another 5p on the average price of diesel.

“We are concerned that too few drivers are benefitting from these incredibly low oil prices as many less competitive retailers are still selling fuel at far nearer to £1.10 a litre than £1," said Simon Williams, RAC spokesman.