In the week that UK food price inflation hit its highest level in more than 45 years, the detailed official statistics show that if British consumers want to look after the pounds in their pockets, they should eat sweet potato.

Office for National Statistics data shows prices of the orange tuber rose only 2 per cent in the year to March, exactly in line with the Bank of England’s inflation target. Overall food prices, by contrast, jumped 19.2 per cent.

The reasonable cost of sweet potatoes — the only item the ONS measures in its “other tubers and products of tuber vegetables” category — will do very little to help households with the cost of living, however. Families in the UK, on average, dish out only £0.30 on them in every £1,000 they spend. Food in general accounts for £107.

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