📜 British History
UK Metrication History
In 1965 Britain decided to go metric. Sixty years later, the country still weighs itself in stone, drives in miles, and drinks pints. This is the story of the conversion that never finished.
The Timeline: 1965 to Today
1965
The government announces that Britain will adopt the metric system, following requests from industry. Crucially, the programme is voluntary: no Act of Parliament compels the switch.
1969
The Metrication Board is established to coordinate the changeover industry by industry. Early progress is good in manufacturing and science.
1973
Britain joins the European Economic Community, adding external pressure for metric alignment with European trading partners.
1979-1980
The government abandons the metrication policy. The Metrication Board is abolished in 1980 with the job half done. Voluntary conversion stalls wherever public habit resists it.
1985
The Weights and Measures Act 1985, passed to comply with EU directive 80/181/EEC, removes the stone and other imperial units from trade. Metric becomes the legal language of commerce.
1995-2000
Loose goods must go metric: by 2000, butchers, greengrocers, and markets have to sell in kilograms. Imperial may appear only as a supplementary indication.
2001
Sunderland greengrocer Steven Thoburn is convicted for using imperial-only scales, becoming the "metric martyr" and making metrication front-page news.
2007
The EU abandons plans to force full metrication, confirming Britain's permanent derogations: miles on road signs, pints for draught beer and milk in returnable bottles.
Why Britain Never Finished the Job
Compare Britain with Australia, which started later and finished completely. Three differences explain the outcome:
- Voluntary vs compulsory: Britain's programme was voluntary, relying on industries to convert when ready. Where conversion cost money or annoyed customers, it simply did not happen. Australia's was centrally driven.
- Politics: metrication became entangled with Euroscepticism. What began in 1965 as an industrial efficiency measure was reframed as Brussels imposing foreign units on Britain, and politicians learned to leave it alone.
- The Board was killed: abolishing the Metrication Board in 1980 removed the institution whose job was to finish the task. After that, metrication advanced only where EU law required it, which is why trade went metric but daily life did not.
The result is the split personality modern Britain lives with: metric where the law reaches (shops, medicine, industry, official statistics) and imperial where it does not (body weight, road distances, beer). The stone's survival is not an accident; it is the direct product of a conversion that stopped halfway.
The Metric Martyrs
No history of British metrication is complete without the "metric martyrs": traders prosecuted for defying metric law. The most famous, Steven Thoburn, was a Sunderland greengrocer convicted in 2001 for using scales that displayed only imperial weights. His supporters cast him as a defender of British tradition against European bureaucracy; the courts saw a straightforward breach of weights and measures law. Thoburn died in 2004, but his case fixed the metrication debate in the public mind as a culture war rather than a technical standard.
The martyrs' real legacy was political: after Thoburn, no government wanted to be seen forcing metrication on an unwilling public. The EU's 2007 decision to drop full-metrication plans and make Britain's derogations permanent effectively ended the story. Britain would keep its miles, pints, and stone indefinitely.
Where Things Stand After Brexit
Brexit reopened the question. The UK government consulted on allowing shops to sell in pounds and ounces again, presenting it as a restoration of choice. But the proposals concerned labelling, not a return to imperial trade measurement: the legal status of the stone is unchanged, and metric remains the language of British commerce.
The honest summary of sixty years: Britain metricated its economy and kept its culture. Factories, laboratories, hospitals, and supermarkets run on metric; people run on stone, miles, and pints. No other major country lives so comfortably in two systems, and there is no sign of that changing.
Frequently Asked Questions
When did the UK start metrication?
In 1965, when the government announced that Britain would adopt the metric system. The Metrication Board was set up in 1969 to manage the changeover, but the programme was abandoned in 1979 and the Board abolished in 1980.
Why did UK metrication fail?
It was voluntary rather than compulsory, it lost political backing in the late 1970s, and public attachment to imperial units proved stronger than expected. The result is the dual system Britain still uses: metric in shops and official life, imperial in daily habits like the stone.
Who were the metric martyrs?
Traders prosecuted for using imperial-only weighing equipment after metric became mandatory for loose goods. The most famous was Sunderland greengrocer Steven Thoburn, convicted in 2001, whose case became a cause celebre for opponents of metrication.
Is the UK still metricating?
No active programme exists. Loose goods went metric by 2000, but miles, pints, and the stone survive by law or custom. Post-Brexit reviews discussed restoring imperial labelling, but no return to imperial trade measurement has happened.