The UK drink drive limit is 35 micrograms of alcohol per 100 millilitres of breath, or 80 milligrams per 100 millilitres of blood, in England, Wales, and Northern Ireland. Scotland is stricter: 22 micrograms in breath and 50 milligrams in blood. Go over either limit while driving, attempting to drive, or sitting in charge of a vehicle, and you face a mandatory driving ban of at least 12 months, an unlimited fine, and up to six months in prison.
The Limit in England, Wales, and Northern Ireland
The Road Traffic Act 1988 sets a single threshold across all three nations, and it applies to every driver regardless of experience, licence type, or vehicle:1Legislation.gov.uk. Road Traffic Act 1988 – Section 5
- 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
Crossing from England into Wales changes nothing. Driving into Northern Ireland from the Republic puts you under the same figures.
The Limit in Scotland
Scotland cut its limits in December 2014 using devolved powers under the Road Traffic Act 1988 (Prescribed Limit) (Scotland) Regulations 2014.2Legislation.gov.uk. The Road Traffic Act 1988 (Prescribed Limit) (Scotland) Regulations 2014 The Scottish thresholds are:
- 22 micrograms of alcohol per 100 millilitres of breath
- 50 milligrams of alcohol per 100 millilitres of blood
- 67 milligrams of alcohol per 100 millilitres of urine
Those numbers are roughly 37 percent lower than the rest of the UK.3mygov.scot. Drink-drive Limit in Scotland For some people, a single drink is enough to put them over, depending on body weight, metabolism, and whether they’ve eaten. If you drive from England into Scotland, the lower limit kicks in the moment you cross the border. There are no signs warning you.
What Counts as a Drink
There is no reliable way to convert pints or glasses into a safe amount, and the file none of the usual rules of thumb survive contact with real bodies. Alcohol leaves the system at roughly one unit per hour on average. A bottle of wine contains around 10 units, so finishing one at midnight means you may still be over the limit well into the morning. Coffee, food, and cold showers do nothing to speed the process up.
This is why morning-after driving catches so many people. You stop drinking, sleep seven hours, feel fine, and get into the car still over the limit. Police run regular morning-after enforcement, and a conviction at 8 a.m. on the school run carries the same penalties as one at 2 a.m. outside a pub.
Penalties if You’re Caught Driving Over the Limit
A conviction for driving or attempting to drive while over the limit brings a stacked set of consequences:
- Up to six months in prison
- An unlimited fine, usually scaled to your income
- A driving ban of at least 12 months, rising to at least three years if you have a previous drink driving conviction within the past 10 years
- A DR10 endorsement on your licence that remains visible for 11 years from the date of conviction
- Between 3 and 11 penalty points if, for any reason, the court does not impose a ban
The prison term and mandatory ban come from Schedule 2 of the Road Traffic Offenders Act 1988, and the government confirms the fine is unlimited.4GOV.UK. Drink-driving Penalties The three-year minimum for repeat offenders sits in section 34 of the same Act.5Legislation.gov.uk. Road Traffic Offenders Act 1988 – Section 34 The 11-year endorsement is the quiet killer. Insurers can see it the whole time and often refuse cover or charge significantly more.6GOV.UK. Endorsement Codes and Penalty Points
Refusing a Breath, Blood, or Urine Test
Refusing to provide a specimen when lawfully required is a separate offence under section 7(6) of the Road Traffic Act 1988, and the penalties mirror those for actually driving over the limit: up to six months in prison, an unlimited fine, and a driving ban of at least 12 months.4GOV.UK. Drink-driving Penalties A previous relevant conviction within the past 10 years pushes the minimum ban to three years.7Sentencing Council. Fail to Provide Specimen for Analysis (Drive/Attempt to Drive) Refusal also triggers high-risk offender status with the DVLA, so you pick up extra hurdles on top of an identical punishment. There is no tactical reason to refuse.
Being “In Charge” of a Vehicle
You don’t have to be driving to be convicted. Being in charge of a vehicle while over the limit is a separate offence that covers sleeping in a parked car, sitting in the driver’s seat, or being otherwise in a position where you could drive. The penalties are lower:
- Up to three months in prison
- A fine of up to £2,500
- A discretionary driving ban, or up to 10 penalty points if no ban is imposed4GOV.UK. Drink-driving Penalties
You can argue there was no likelihood you would have driven, but that defence is yours to prove.
High-Risk Offender Status
Some drink driving convictions trigger a DVLA classification that extends how long you stay off the road. You’ll be flagged as a high-risk offender if any of these apply:
- Your reading was at least 87.5 micrograms in breath, 200 milligrams in blood, or 267.5 milligrams in urine (roughly two and a half times the England, Wales, and Northern Ireland limit)
- You were convicted of two drink driving offences within 10 years
- You refused to provide a specimen, or refused to let a blood sample be tested
High-risk offenders can’t just wait out the ban and reapply. You have to pass a DVLA medical that includes blood tests for alcohol biomarkers, and you pay for it yourself.8GOV.UK. Disqualification for Drink-driving The medical typically adds weeks or months to the end of your ban. Fail it and you stay off the road.
Reducing Your Ban With a Rehabilitation Course
When sentencing you, the court can offer a place on an approved drink-drive rehabilitation course. Completing it cuts your ban by up to 25 percent, which takes about three months off a 12-month disqualification.9GOV.UK. Drink-drive Rehabilitation Courses – When You Can Take a Course The decision rests with the court; you can’t request a place yourself, and you pay the course fee. Northern Ireland runs its own equivalent scheme with the same potential reduction.10NI Direct. Courses for Drink Drive Offenders The sessions run over several weeks and cover alcohol’s effects on driving and strategies to avoid reoffending. Miss sessions or fail to engage and you can lose the reduction.