The UK alcohol limit for driving depends on where you are. In England, Wales, and Northern Ireland, you are over the limit at 35 micrograms of alcohol per 100 millilitres of breath, 80 milligrams per 100 millilitres of blood, or 107 milligrams per 100 millilitres of urine.1Legislation.gov.uk. Road Traffic Act 1988 – Section 11 Scotland uses lower figures: 22 micrograms of breath alcohol, 50 milligrams in blood, or 67 milligrams in urine.2Scottish Government. Drink-Drive Limit: Policy Go over, and a first offence carries up to six months in prison, an unlimited fine, and a driving ban of at least 12 months. If someone dies as a result, the maximum is now life imprisonment.3GOV.UK. Drink-Driving Penalties
The Limit in England, Wales, and Northern Ireland
Section 11 of the Road Traffic Act 1988 sets the “prescribed limit” for these three nations. You commit an offence if any of the following readings comes back above the threshold:1Legislation.gov.uk. Road Traffic Act 1988 – Section 11
- 35 micrograms of alcohol per 100 millilitres of breath
- 80 milligrams of alcohol per 100 millilitres of blood
- 107 milligrams of alcohol per 100 millilitres of urine
The limit is the same for every driver, regardless of age or experience. There is no lower threshold for learners or newly qualified drivers.
The Limit in Scotland
Scotland cut its limits in December 2014 to bring them closer to the rest of Europe.2Scottish Government. Drink-Drive Limit: Policy The thresholds are:4mygov.scot. Drink-Drive Limit in Scotland
- 22 micrograms per 100 millilitres of breath
- 50 milligrams per 100 millilitres of blood
- 67 milligrams per 100 millilitres of urine
Those readings are roughly 37% lower than the English, Welsh, and Northern Irish figures. A driver who blows 30 micrograms is legal in England but committing an offence in Scotland. The Scottish limit applies the moment you cross the border, and the penalties for exceeding it are the same as elsewhere in the UK. In practice, even a single drink can put some people over.
How Many Drinks Does That Translate To
Nobody can give you a reliable answer. How alcohol affects your blood level depends on your weight, sex, metabolism, stress levels, how recently you ate, and the strength of what you drank. Two people drinking the same amount can produce very different breath readings. Police advice across the UK is to avoid alcohol altogether if you intend to drive.
The morning after catches a lot of people out. Your body processes about one unit of alcohol per hour on average, but the rate varies and nothing speeds it up. A heavy night ending at midnight can easily leave you over the limit at 8 a.m. Police run morning-after enforcement operations, particularly over Christmas and New Year. If in doubt, leave the car.
How Police Test You
An officer can require a breath test if they reasonably suspect you have been drinking, if you have committed a moving traffic offence, or after a collision. The roadside device gives a pass or fail. Fail it, or show signs of impairment, and you will be taken to a station for an evidential breath test on a calibrated machine. That station reading is what gets used in court.
If you cannot provide a breath sample for medical reasons, or the evidential machine is unavailable, officers will take blood or urine instead. You do not choose which; the officer or a medical professional decides. Laboratory results carry the same legal weight as a breath reading.
Refusing to provide a sample without a reasonable medical excuse is a separate offence under Section 7 of the Road Traffic Act 1988.5Legislation.gov.uk. Road Traffic Act 1988 – Section 7 The penalties match those for drink driving: up to six months in prison, an unlimited fine, and a mandatory ban of at least 12 months.3GOV.UK. Drink-Driving Penalties Refusing does not help you avoid conviction. It just adds a charge.
Penalties for Driving Over the Limit
A conviction for driving or attempting to drive while over the limit carries:3GOV.UK. Drink-Driving Penalties
- Up to six months in prison
- An unlimited fine
- A driving ban of at least 12 months, rising to at least three years if you are convicted twice within 10 years
The ban is mandatory. Magistrates have no discretion to let you keep your licence for a standard drink-driving conviction. You also pick up a criminal record and an endorsement code (typically DR10 or DR20) that stays on your driving record for 11 years from the date of conviction.6GOV.UK. How Long Endorsements Stay on Your Driving Record
Being “In Charge” of a Vehicle
You do not have to be driving. Being “in charge” of a vehicle while over the limit is a separate offence that catches people sitting in parked cars with the keys, sleeping it off in the driver’s seat, or supervising a learner. The penalties are lower but still substantial:3GOV.UK. Drink-Driving Penalties
- Up to three months in prison
- A fine of up to £2,500
- A driving ban, which is possible but not automatic
If no ban is imposed, the court must endorse your licence with 10 penalty points.
Causing Death While Over the Limit
If someone dies as a result of careless driving and you are over the alcohol limit, the offence changes character. For offences committed after 28 June 2022, the maximum sentence is life imprisonment, raised from the previous 14-year cap by the Police, Crime, Sentencing and Courts Act 2022.7Legislation.gov.uk. Police, Crime, Sentencing and Courts Act 2022 – Section 86 A substantial prison sentence is the norm.8Sentencing Council. Causing Death by Careless Driving When Under the Influence of Drink or Drugs
Getting Your Licence Back
Not every convicted driver goes through the same process at the end of a ban. The DVLA classifies you as a “high risk offender” if your reading was at least 87.5 micrograms in breath, 200 milligrams in blood, or 267.5 milligrams in urine. You also qualify if you were convicted twice within 10 years or if you refused to provide a sample.9GOV.UK. Disqualification for Drink-Driving
High risk offenders cannot simply reapply when the ban expires. You must first pass an independent medical examination arranged by the DVLA. It includes a physical examination, a detailed questionnaire about your drinking history, and a blood test measuring CDT (carbohydrate deficient transferrin), a biomarker for recent heavy drinking. If the results suggest ongoing misuse, your application will be refused and you will need to reapply later. The process can add weeks or months to the time before you drive again.
Courts sometimes offer convicted drivers a rehabilitation course. If offered and completed, it reduces the ban by up to a quarter. The course runs about 16 hours over three sessions in three weeks, and you pay for it yourself.10GOV.UK. Drink-Drive Rehabilitation Courses: How the Course Works On a 12-month ban, that is three months off. The court is under no obligation to offer the course, and completing it does not remove the endorsement, which still sits on your record for 11 years.6GOV.UK. How Long Endorsements Stay on Your Driving Record
The Longer-Term Fallout
Court penalties are only part of the picture. A conviction has consequences that run for years.
Car insurance is the quickest hit. Insurers treat a drink-driving endorsement as a major risk indicator, and premiums commonly rise by 80% or more. Some will not quote at all, pushing you onto specialist convicted-driver policies that cost significantly more. The higher cost typically lasts until the endorsement drops off your record.
Employment consequences depend on the role. Anyone whose job involves driving will almost certainly lose it during the ban. Many employers require disclosure of unspent convictions, and a drink-driving conviction can appear on Disclosure and Barring Service (DBS) checks, which matters for work in healthcare, education, transport, and security.
International travel also gets harder. The United States does not recognise the UK’s Rehabilitation of Offenders Act and treats a criminal conviction as potentially permanent, which generally rules out the visa-free ESTA route and pushes you towards a formal visa application and embassy interview. Canada is similarly strict at the border, though you can apply for criminal rehabilitation after five years. Australia applies a character test during the visa process that requires full disclosure.
Between the 11-year endorsement, the insurance surcharge, and the travel complications, a single conviction can shape your life for more than a decade.