Image caption Traders sell fruit and veg in pounds and ounces although they cannot weigh it that way

Not giving an inch, going the extra mile, entering the final furlong, piling on the pounds and doing the hard yards - the English language is rich with phrases derived from the units British people use to measure distances, sizes and quantities.

Known as imperial measures - because they were defined in law in the early 19th Century and spread across the British Empire - these units have a place in our collective vocabulary and history, but could they be about to make a comeback in every day commercial use following the vote to leave the EU?

Although steps towards metrication began nearly a decade before the UK joined the EU in 1973, the gradual adoption of a French measurement system has become synonymous with European integration in the eyes of many and Brexit a priceless opportunity to inch away from it.

Since June's Brexit vote, a number of companies, ranging from butchers to wine merchants, have said they would relish the chance to be able to trade in imperial units.

Simon Berry, chairman of Berry Bros & Rudd, has gone as far as to say it is his lifetime's ambition to sell champagne in pint-sized bottles - currently outlawed in the UK - and in his words to reclaim it from "rules-obsessed bureaucrats".

'Part of identity'

Campaigner Warwick Cairns says people feel this way because imperial measurements are not only easily understandable but inherently popular.

"There is something about feet and inches that feel part of our identity and culture," he says. "They make sense on a human scale, they make sense on a cultural scale. It is part of us."

Image copyright PA Image caption Attempts to continentalise the UK's road network came to nothing

A brief history of weights and measures

AD965: King Edgar decrees only "one weight and measure shall pass through the King's dominions".

1824: The British Weights and Measures Act defines imperial units

1960: India begins the transition from imperial to metric

1965: The UK government says industry should embrace metric within 10 years

1971: Decimal currency is introduced in the UK

1973: The proposed date for adopting kilometres for road signs lapses

1985: The Weights and Measures Act recognises the parity of metric and imperial measures

1994: Regulations are introduced requiring weighing in metric

2001: Steve Thoburn and other market traders are convicted for selling goods in only imperial measures

2008: EU commissioners rule Britain can carry on using imperial measurements such as pints, pounds and miles

Mr Cairns, who represents the imperial-supporting British Weights and Measures Association and is the author of a book about the issue, insists that people should not be required to use either system, because modern technology can easily accommodate both.

"This is the chance for people to be free to use whatever measures they please," he says.

"Take my bathroom scales. If I want to weigh myself in kilograms, I can. Flick the switch the other way, and I can weigh myself in stones and pounds. There is no reason why you can't do that."

Image caption Most weighing machines are now metric, as is the equipment used to test them

Controversial attempts by the EU - aided and abetted by successive British governments - to make the UK move to a single metric system officially came to an end in 2008, when Brussels agreed to the continued use of pints (for draught beer and cider), pounds and miles, alongside metric units.

Current laws require traders to use metric measurements when weighing packaged or loose goods for sale in England, Wales and Scotland but still allow them to sell goods in imperial quantities and display prices in imperial as long as they do not "stand out more" than the metric signs alongside them.

The rules are not rigorously enforced today, after public and political furore over the prosecution of the "metric martyrs", a group of market traders convicted 15 years ago of selling goods using only imperial measures.

Image copyright Getty Images Image caption But pint measures never went away when it came to draught beer and cider

But they are still seen, by both sides of the argument, as a dog's breakfast ripe for reform.

Advocates of metric say it is perfectly feasible for the two systems to co-exist but does not make commercial sense.

"The current measurement muddle aids only our competitors," says Derek Pollard, the chairman of the UK Metric Association.

'Norms and rules'

With 90% of the UK's trade taking place with metric countries - the US being the stand-out exception - he says the UK would be at a big disadvantage if it reverted.

"To compete effectively, we need a single, logical and universal measurement system that everyone understands and is familiar with," Mr Pollard says.

This view is shared by the UK Weighing Federation, which speaks on behalf of companies manufacturing, installing and repairing commercial scales and associated equipment - including components, instrumentation and software.

Image copyright AP Image caption Most of the Commonwealth, including India, uses metric measurement

Not only, it says, are most imperial measuring scales now consigned to people's lofts or on display in museums, but the equipment used to test commercial weights to guarantee their conformity with technical and safety standards - a procedure known as type approvals - is not available for any mass switch back to imperial.

"All measuring equipment is designed to record in metric," says its president, Nick Catt.

"If you want to be a manufacturing country and want to have a strong connection with Europe, then you have to follow the European norms and rules.

"Otherwise it would be chaos and it would be consumers who lose out."

'Impractical'

Having a dual system of metric and imperial would, he says, involve a "phenomenal" cost to retailers, which would inevitably be passed on to customers - an outcome at odds with the deregulatory impetus behind Brexit.

"It would just not be practical," Mr Catt says.

"You would have to teach kids in schools what pounds are.

"We are talking about an era that is gone, and we can't turn the clock back that far."

The act of Brexit, in and of itself, will not see "lb" signs springing up all over the UK.

For that to happen, Parliament would need to repeal the current regulations, dating back to the mid-1990s, obliging traders to sell their products in metric weights.

Image copyright Getty Images Image caption Babies' birth weights are commonly announced in pounds and ounces

As far as the government is concerned, such a change is not on the horizon while it focuses on reassuring investors the UK is open for business globally after the Brexit vote.

"Businesses can already use imperial units alongside metric, or on their own for draught beer and cider, bottled milk and road traffic signs," a spokesman for the Department for Business, Energy and Industrial Strategy said.

"This is national legislation and there has been no change to the law since the referendum result."

While the issue is unlikely to be the first port of call for MPs as they seek to decouple the UK from 40 years of EU-related legislation over the coming years, there is a body of opinion within Parliament that would support such a move.

In 1998, 89 MPs signed a parliamentary motion opposing compulsory metrication and the prosecution of traders continuing to use imperial.

The motion, which also pledged its support for the "use of customary UK measures", shows imperial measures have friends in high places.

Among those to sign were Jeremy Corbyn and Philip Hammond - then humble backbenchers but now Labour leader and Chancellor of the Exchequer.