After nearly two decades of strict hand-luggage regulations, the long-standing 100 ml liquid limit at major UK airports has finally been scrapped at many hubs, bringing a welcome change for travellers. The shift comes as airports complete the rollout of next-generation computed tomography (CT) security scanners that enable more detailed screening of luggage without passengers having to unpack liquids and electronics.

Under the new security procedures now in place at airports including London Heathrow, London Gatwick, Birmingham, Bristol and Edinburgh, flyers can carry liquids in containers of up to two litres in their hand luggage — and keep them inside their bags when going through security.

The changes are the result of a multi-year technology upgrade. CT scanners produce high-resolution 3D images of carry-on bags’ contents, allowing security staff to identify potential threats without requiring liquids, laptops or other electronics to be removed for separate screening.

Heathrow, the UK’s busiest airport, has now completed the full rollout across all four terminals, making it one of the largest international hubs in the world to adopt the new system and dispense with the old 100 ml limit.

Airport officials say the move will speed up security lines, reduce stress for passengers and cut down on plastic waste — eliminating the need for millions of single-use clear bags each year.

However, the change does not mean the rule is gone everywhere just yet. At some UK airports that have not yet fully installed or had approval for the new scanners, the traditional 100 ml limit may still apply, albeit with some relaxations — such as no longer requiring liquids to be packed in a separate plastic bag.

Passengers are also reminded that rules may vary internationally: departing from a UK airport that has scrapped the limit does not automatically mean the same relaxed rules apply on the return leg or at their destination. Airlines and airport websites remain the best source for the latest security guidance ahead of travel.