Heathrow Airport has officially abolished the long‑standing 100ml liquid limit for passengers, becoming the largest airport in the world to fully deploy next‑generation CT security scanners across all terminals. The move marks a major shift in UK aviation security and promises a smoother, less stressful journey for millions of travellers.
🧳 What’s Changing for Passengers
With the new scanners in place, travellers flying out of Heathrow can now:
- Keep liquids up to two litres inside their hand luggage
- Leave electronics — including laptops and tablets — inside their bags
- Skip the clear plastic liquid bags entirely
The advanced CT technology provides highly detailed 3D images of cabin baggage, allowing security teams to inspect items without requiring passengers to unpack.
Heathrow says the system can process “thousands of passengers an hour” while maintaining strict safety standards.
🇬🇧 A Patchwork of Rules Across the UK
Despite Heathrow’s milestone, the UK remains inconsistent. Several airports — including Gatwick, Edinburgh, Birmingham, Bristol, and Belfast — have already raised their liquid limits to two litres. Others, even with the scanners installed, are still waiting for Department for Transport (DfT) approval before lifting the 100ml cap.
This inconsistency has caused confusion among travellers, especially after the government ordered smaller airports in June 2024 to temporarily reinstate the 100ml rule, despite having already upgraded their scanners.
The EU also reverted to the 100ml limit in July 2024, adding another layer of complexity for international passengers.
🔍 Scanner Sensitivity Raises Questions
A recent Which? report highlighted that the new scanners’ heightened sensitivity has led to more manual bag checks at some airports. While the technology is more capable, it can also flag more items for inspection.
🕰 A Long Road to Reform
The journey to this point has been anything but smooth:
- 2019: Boris Johnson pledged the 100ml rule would end by 2022
- 2020–2021: The pandemic delayed progress
- 2022: Government promised full rollout by June 2024
- 2024: Major airports missed the deadline; smaller airports were told to revert to old rules
Heathrow’s £1bn investment has finally delivered the upgrade, but the rest of the UK remains in transition.
🌍 Heathrow Stands Alone Among Global Giants
Among the world’s ten busiest airports, Heathrow is now the only one to fully scrap the 100ml limit for international flights — a significant distinction in global aviation.
🗣 Calls for Clearer Communication
Travel industry groups warn that inconsistent rules across airports are leaving passengers confused.
Julia Lo Bue‑Said, CEO of the Advantage Travel Partnership, said differing timelines have “led to confusion and frustration,” urging airports and government to coordinate messaging more effectively.
📌 What Travellers Need to Know
- The new rules apply only to flights departing Heathrow
- Passengers must still follow the rules of the airport they fly back from
- Until the DfT approves changes elsewhere, travellers should check each airport’s guidance before flying
Heathrow’s chief executive Thomas Woldbye says the upgrade means passengers can spend “less time preparing for security and more time enjoying their journey.” For many, this long‑awaited change will feel like the end of an era — and the beginning of a much easier one.
