Gatwick Airport says that there should not be any delays to flights leaving UK airports.
A spokesman added:
Other airports across the country have also been affected and the problem is having a particular impact on non-EU airline customers.
A Heathrow spokesman said:
A Government spokesman said:
Passengers at Heathrow and Gatwick are facing long queues at passport control because of a fault with UK Border Force computers.
Border Force officers at Heathrow Airport have made what is believed to be their biggest seizure of cannabis in more than three years.
The drugs, which weighed around 1.5 tonnes and had an estimated street value of approximately £4.3 million, were discovered in three separate air freight containers on Monday 24 September.
All the containers had arrived on the same flight from Accra in Ghana and otherwise contained fresh fruit and vegetables. The drugs were in separate tape-wrapped compressed packages within boxes. There were so many packages Border Force officers filled seven wheelie bins with the drugs.
The Head of the Border Force, Brian Moore, said that our border controls were generally very efficient.
The Border Force expects most British or European nationals to travel through passport control in 25 minutes or less, and most foreign nationals within 45 minutes.
But occasionally, disruption is caused by issues like flight bunching, where several flights arrive at the same time.
He added: "Occasionally there is some disruption to travelling passengers, which we regret. But we all want a safe United Kingdom and a strong border."