Drink Drive Limits and Penalties: The Numbers Your Theory Test Expects You to Know

Alcohol questions are among the easiest marks on the theory test, because the answers are fixed numbers rather than judgement calls. They are also among the most commonly dropped, because learners assume the rule is roughly "do not drink and drive" and never learn the actual figures. The test does not ask you how you feel about drinking and driving. It asks what the limit is, what happens if you exceed it, and how long the effects last. Here are the numbers, and why one of them changes depending on where in the UK you are driving.

The limits, exactly as they are set

There are three ways alcohol is measured, and each has its own threshold. In England, Wales and Northern Ireland the limits are 35 micrograms per 100 millilitres of breath, 80 milligrammes per 100 millilitres of blood, and 107 milligrammes per 100 millilitres of urine.

Breath is the figure that comes up most often, because it is what a roadside test measures. If you learn only one number, learn 35. If you can hold three, learn 35, 80 and 107 in that order, and remember they run breath, blood, urine from smallest to largest.

Why Scotland is different

Scotland sets lower limits than the rest of the UK: 22 micrograms per 100 millilitres of breath, 50 milligrammes per 100 millilitres of blood, and 67 milligrammes per 100 millilitres of urine. This catches people out constantly, both in the test and on the road, because a driver crossing the border does not get a warning that the threshold has just dropped by more than a third.

A neat way to hold it: the Scottish breath figure, 22, is well under two thirds of the 35 that applies elsewhere. If a question specifies Scotland, the answer is one of the lower set. If a question does not specify a country, it is asking about England and Wales.

There is no safe number of drinks

This is the point behind a whole cluster of theory test questions, and the reasoning matters more than the wording. It is impossible to say how many drinks any given limit equals, because alcohol affects everyone differently. Your weight, age, sex and metabolism all change the outcome, as does the type and amount of what you are drinking, what you have eaten recently, and your stress levels at the time.

So when a question offers "two pints" or "one glass of wine" as an option, that option is wrong by construction. The DVSA is not testing arithmetic, it is testing whether you understand that the arithmetic cannot be done reliably. The same logic explains the morning-after questions: alcohol leaves the body at its own pace and nothing speeds that up. Coffee, a cold shower, food and fresh air change how alert you feel, not how much alcohol is in your blood.

The penalties you are expected to know

Driving or attempting to drive while above the limit carries up to 6 months in prison, an unlimited fine, and a driving ban of at least a year. If you are convicted twice within 10 years, the minimum ban rises to 3 years. Refusing to provide a specimen of breath, blood or urine for analysis carries the same penalties, which is worth remembering because "refuse the test" appears as a tempting wrong answer.

Being in charge of a vehicle while over the limit, without driving it, is a lesser but real offence: up to 3 months in prison, a fine of up to £2,500, and a possible ban. Causing death by careless driving while under the influence is at the other end of the scale, carrying up to life imprisonment, an unlimited fine, a ban of at least 5 years, and an extended driving test before the licence comes back.

The sentence in any case is decided by the magistrates who hear it, which is why theory test wording tends to use "may get" and "at least" rather than fixed amounts.

The consequences that outlast the ban

A conviction does not end when the disqualification does. Car insurance costs rise significantly afterwards. If you drive for work, your employer will see the conviction on your licence. It can also cause difficulty travelling to some countries, including the USA. Anyone banned by a UK court for drink driving cannot drive anywhere in the UK during that ban, so moving between the four nations changes nothing.

Some drivers banned for 12 months or more are offered a place on a drink-drive rehabilitation scheme course, which can shorten the ban. It is worth knowing that this is offered at the court's discretion rather than claimed as a right, because that distinction turns up in questions.

Turning this into marks

The alcohol section rewards flat memorisation more than almost any other part of the syllabus. Six numbers cover the limits, and a short list covers the penalties. Learn them properly once and they are dependable marks every time they appear, which matters when the pass mark leaves you only seven wrong answers out of 50.

Theory Test Passed works through the alcohol and drugs topic alongside every other section of the DVSA licensed question bank, so you can drill the figures until they stick rather than hoping the question phrases itself kindly. Practise them now and they are three or four marks you will never have to think twice about.