The planning by government officials was first reported by the Times.
Speaking to Sky News on Thursday, Business Secretary Peter Kyle said the availability of carbon dioxide was not a concern for the British economy “at this moment.”
“Right now, people should go on as they are,” he said.
Petrol and diesel prices have soared since the US and Israel launched wide-ranging strikes on Iran on 28 February and Iran effectively shut the Strait of Hormuz – a crucial global waterway for oil and gas transport.
Iran’s blockade has led to higher costs globally for fuel and fertiliser, both crucial elements of food production.
Earlier this week the International Monetary Fund warned that the war could plunge the global economy into recession, with the UK set to be the hardest hit of the world’s advanced economies.
The National Farmers Union has said that the price of cucumbers and tomatoes could rise over the next six weeks, with the cost of other crops and milk increasing in the next three to six months.
US President Donald Trump has suggested talks aimed at ending the war in Iran could resume this week, after negotiations collapsed at the weekend, prompting the US to blockade Iranian ports.
On Wednesday Chancellor Rachel Reeves said the US made a “mistake” by ending diplomatic negotiations with Iran and entering into military conflict.