Passengers going through Heathrow Airport can now take up to two litres of liquid through security in their hand luggage.
The airport said it has completed the £1 billion rollout of new scanners which mean passengers can keep liquids and large electronic devices in their hand luggage when going through security.
Heathrow said it is the largest airport in the world to deploy the technology for all passengers.
The changes are because modern CT security scanners produce more detailed images of what is inside luggage.
Among other UK airports which have completed the rollout of the new scanners are Birmingham, Bristol, Gatwick and Edinburgh.
Some airports such as London City, Luton and Teesside have the new scanners allowing passengers to keep liquids in bags, but only in containers holding up to 100ml pending regulatory approval of the systems they are using.
Airport security rules over liquids were introduced in 2006 following a foiled terror plot to blow up planes flying from London to the US with homemade liquid bombs.
What are the new airport rules?
Liquids in containers up to 2 litres can remain in cabin bags and be taken through security in all terminals (T2, T3, T4 and T5).
Refillable metal or double walled containers must be emptied but these can be refilled once through security.
Ensure your electronic devices are charged. If they don't switch on, you may not be allowed to take them on to the aircraft.