UK Drink Drive Limits — Why Scotland Is Different

Most people assume the drink drive limit is the same everywhere in the UK. It isn't — Scotland's limit is significantly lower than England, Wales and Northern Ireland, and the difference is big enough that a drink you'd get away with south of the border could put you over the limit north of it.

The limits, nation by nation

England, Wales and Northern Ireland: 35 micrograms of alcohol per 100ml of breath, 80mg per 100ml of blood, or 107mg per 100ml of urine.

Scotland: 22 micrograms per 100ml of breath, 50mg per 100ml of blood, or 67mg per 100ml of urine — noticeably lower across all three measures.

Because Scotland's limit is so much lower, it's genuinely possible for a single pint to put a driver over the limit there, in a way it might not elsewhere in the UK. There's no reliable "safe" number of drinks that applies to everyone — alcohol tolerance and processing speed vary by body weight, sex, metabolism, and what's been eaten, and the body only processes roughly one unit of alcohol per hour on average. The only genuinely safe approach is not drinking at all if you're driving.

Drug driving limits

Drug driving works on a similar zero-tolerance-style basis for illegal drugs, with specific blood limits set for each substance. For cannabis (THC), the limit is 2 micrograms per litre of blood — a threshold low enough that it's not really a "limit" in the way alcohol's is, more a confirmation that any meaningful presence is an offence. Cocaine and MDMA are set at 10 micrograms per litre, ketamine at 20, and LSD at 1. The penalties for drug driving are the same as for drink driving.

What the penalties actually are

Drink or drug driving convictions carry up to 6 months in prison, an unlimited fine, and a minimum 12-month driving ban. The endorsement itself (code DR10) stays on your licence for 11 years — far longer than most other driving offences, which typically fall off after 4 years.

This has knock-on effects beyond the immediate ban: a drink-drive conviction can significantly increase insurance costs for years afterwards, and some employers and countries (particularly for visa applications) will ask about convictions within a set look-back period, which an 11-year endorsement can still fall within long after the ban itself has ended.

Not sure where you stand?

Our free UK Driving School Companion answers nation-specific questions on drink and drug driving, penalties, and licence endorsements — just select your location and ask.