Gatwick, Heathrow, Manchester and Edinburgh airports have all reported problems with self-service passport gates. The IT issue has seen travellers stuck on planes and waiting “hours” to board flights. Heathrow airport said the issue is due to “e-gates” which are operated by Border Force.
Other users have shared photos of long queues and views from inside planes.
Documentary maker Louis Theroux described Heathrow as a “human logjam”.
He tweeted: “Human logjam at Heathrow – apparently all the e gates at all the airports are down? That’s what the man just said.”
Edinburgh Airport commented on the delays, saying: “The UK Border Force (UKBF) IT issue is nationwide and UKBF teams are working to resolve this.