Andrea Leadsom suggested Britain will be free to use whatever measurement system people choose
The Environment, Food and Rural Affairs secretary said Britain would be free to decide how to label its goods without interference from Brussels, once the divorce was finalised in 2019.
Companies could ditch the EU-sanctioned metric-system and give weights and measurements however they saw fit, she claimed, including using teaspoons to demonstrate how much sugar is present in the product.
Mrs Leadsom said: “Once we have left the EU, we will get the opportunity to look at how we can change rules that will be better for the United Kingdom and whether that’s on weights and measures or issues like teaspoons, those are things for the future.”
Under EU law, manufacturers must display metric units on all packaging.
Imperial measurements can be displayed but "cannot stand out more than the metric measurement”.
Warwick Cairns, a spokesman for the British Weights and Measures Association, said: “For well over a hundred years, people in Britain were free to buy and sell in whichever measures they pleased.
“In January 2000, that freedom was taken away. There were raids on greengrocers’ shops and market stalls. Honest traders were turned into criminals.
“It was madness – and the fact that ‘metric martyrs’ like the late Steven Thoburn still have criminal records on file is nothing short of wicked. It would be a truly wonderful thing to have our freedom back.”
The so-called Metric Martyrs were a group of traders prosecuted for selling loose produce without displaying the metric unit of measurement.
The most prominent 'martyr" was Steven Thoburn, a Sunderland market trader who had his scales seized by Trading Standards for selling bananas by the pound.
Steve Thoburn became the original metric martyr after being prosecuted in 2001
He took his legal fight all the way to the European Court of Human Rights, ultimately having his appeal rejected.
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He died suddenly in 2004, having suffered a heart attack aged 39.
Mrs Leadsom's comments echo those of Prime Minister Theresa May, her former Conservative leadership rival, who mentioned food labelling in her party conference speech as a benefit of leaving the EU.
It is also not the first time Mrs Leadsom has promised a bonfire of Brussels bureaucracy once Britain leaves.
She previously pledged to slash farming regulations – controversially including the "three crop rule" which encourages large farms to grow at least three crops to promote biodiversity.