Gatwick Airport says that there should not be any delays to flights leaving UK airports.
A spokesman added:
We are experiencing similar (problems) to the rest of the airports, and we are working to get people through.People should be able to get off the plane, it is those coming through the immigration process which it is frustrating.
There are some longer queues than normal in the terminals, but we have spoken to border force and they are putting on extra staff.Obviously we want to sort the issue out but not risk the integrity of the border controls.
We are currently experiencing temporary IT problems which may add to the time taken to conduct passport checks.We are working to rectify this issue and are providing extra staff to get passengers through the controls as quickly as possible. Our priority remains security of the border.We apologise for any additional time this adds to passengers' journeys.