Thousands of holidaymakers at Heathrow and Gatwick are facing delays and cancellations to their flights after a technical issue hit air traffic control.

Flights have been grounded at London’s two busiest airports with passengers left stranded, with airports across the UK also affected.

National Air Traffic Services (NATS) said the issue is with its “flight processing system” and it is working to rectify the problem.

It said: “Flights are still departing and airspace is open, but recovery will take some time. We will provide further updates as soon as possible.”

Scores of flights have been delayed and cancelled from Heathrow and Gatwick.

Delays and cancellations are expected until at least 9pm.

Follow our live blog for the latest updates on the situation.

Below is a full list of of cancelled and delayed flights from Gatwick and Heathrow as of 5.30pm.

“Enquire with Airline” means a flight may be either cancelled or delayed but passengers are being asked to contact the airline directly.

6.30pm - Harare - Air Zimbabwe

6.35pm - Zurich - Swiss - Cancelled

4pm - Edinburgh - easyJet - Delayed until 10.40pm

4.30pm - Paris- easyJet - Enquire with Airline

4.35pm - Heraklion - easyJet - Delayed until 5.42pm

4.35pm - Salzburg - British Airways - Enquire with Airline

4.40pm - Dubrovnik - easyJet - Enquire with Airline

4.40pm - Isle of Man- easyJet - delayed to 6pm

4.45pm - Milan - easyJet - Enquire With Airline

5pm - Amsterdam - easyJet - Enquire with Airline

5pm - Copenhagen - Norwegian - Enquire with Airline

5pm - Turin - British Airways - Enquire with Airline

5.05pm - Inverness - easyJet -Enquire with Airline

5.05pm - Zurich - easyJet - Enquire with Airline

5.10pm - Lisbon - easyJet - Delayed until 6.04pm

5.10pm - Rome - easyJet - Enquire with Airline

5.15pm - Bari - American - Enquire with Airline

5.20pm - Dublin - Ryanair- Enquire with Airline

5.20pm - Riga- British Airways - Enquire with Airline

5.25pm - Palma - easyJet - Delayed until 5.43pm

5.25pm - Madrid - Air Europa - Delayed to 8.15pm

5.50pm -Copenhagen - easyJet - Delayed until 6.10pm

5.50pm - Montpellier - easyJet - Delayed until 6.06pm

6pm - Amsterdam - easyJet - Enquire with Airline

6pm - Paris - easyJet - Enquire with Airline

6.20pm -Basel/Mulhouse - easyJet - Enquire with Airline

6.20pm - Dublin- Ryaniair - enquire with airline

6.20pm - Naples- easyJet - enquire with airline

6.30pm - Inverness - easyJet - Delayed until 00.20am

6.30pm - Stuttgart - Eurowings - enquire with airline

6.45pm -Bordeaux - easyJet - Delayed until 10.15pm

6.55pm - Belfast - easyJet - Delayed until 10.50pm

7pm - Belfast City - easyJet - Delayed until 11.10pm

7.05pm - Aberdeen - easyJet - Delayed until 10.50pm

7.10pm - Malaga - easyJet - Delayed until 10.35pm

7.15pm -Edinburgh - easyJet - enquire with airline

7.20pm - Jersey - easyJet - Delayed until 10.40pm

7.25pm Glasgow - easyJet - Delayed until 9.05pm

7.30pm - Ibiza - easyJet - Delayed until 10.55pm

8pm - London Gatwick to Berlin - Delayed until 8.20pm

3.35pm - Rome (T5) - British Airways - Delayed until 3.58pm

3.40pm - Virgin Atlantic - Delayed until 4.10pm

3.45pm - Hamburg (T5) - British Airways - Delayed until 10.11pm

4.15pm - Derry (T2) - Loganair - Delayed until 4.50pm

4.30pm - Amsterdam (T5) - British Airways - Delayed until 7.51pm

5.10pm - Madrid (T5) - Iberia - Delayed until 6.10pm

5.30pm - Warsaw (T5) - British Airways - Delayed until 9.47pm

6pm - New York (T2) - United Airlines - Delayed until 9.30pm

6.20pm - Cairo (T5) - British Airways - Delayed until 9.40pm

6.20pm - Glasgow (T5) - British Airways - Delayed until 0.39am

7.05pm - Venice (T5) - British Airways - Delayed until 11.35pm

7.10pm - Rome (T5) - British Airways - Delayed until 10.11pm

7.20pm - Belfast (T5) - British Airways - Delayed until 10.30pm

7.20pm - Larnaca (T5) - British Airways - Delayed until 11.20pm

7.20pm - Tirana (T5) - British Airways - Delayed until 11.59pm

7.25pm - Barcelona (T5) - British Airways - Delayed until 11.44pm

7.30pm - Amsterdam (T5) - British Airways - Delayed until 11.26pm

7.30pm - Vienna (T3) - British Airways - Delayed until 10.11pm

7.35pm - Berlin (T5) - British Airways

7.40pm - Jersey (T5) - British Airways

7.45pm - Frankfurt (T5) - British Airways - Delayed until 9.44pm

7.45pm - Zurich (T5) - British Airways - Delayed until 11.24pm

7.55pm - Marseille (T3) - British Airways - Delayed until 11.58pm

8pm - Geneva (T5) - British Airways - Delayed until 10.51pm

8pm - Prague (T3) - British Airways - Delayed until 11.02pm

8pm - Inverness (T5) - British Airways - Delayed until 0.11am

8.05pm - New York (T3) - Virgin Atlantic - Delayed until 9.30pm

8.05pm - Bucharest (T3) - British Airways - Delayed until 11.55pm

8.15pm - Edinburgh (T5) - British Airways - Delayed until 0.06am

8.15pm - Glasgow (T5) - British Airways - Delayed until 1.20am

8.15pm - Hamburg (T5) - British Airways - Delayed until 0.59am

8.15pm - Delhi (T3) - IndiGo - Delayed until 8.30am

8.20pm - Lisbon (T5) - British Airways - Delayed until 10.48pm

8.20pm - Munich (T5) - British Airways - Delayed until 1.08am

8.20pm - Nice (T5) - British Airways - Delayed until 0.57am

8.20pm - Oslo (T3) - British Airways - Delayed until 0.57am

8.30pm - Athens (T5) - British Airways - Delayed until 0.55am

8.30pm - Basel (T5) - British Airways - Delayed until 0.29am

8.30pm - Copenhagen (T5) - British Airways - Delayed until 1.09am

8.35pm - Stockholm (T5) - British Airways - Delayed until 1.04am

8.35pm - Bologna (T5) - British Airways - Delayed until 4.30am

8.40pm - Paris (T5) - British Airways - Delayed until 11.28pm

8.40pm - Manchester (T5) - British Airways - Delayed until 10.08pm

8.40pm - Milan (T5) - British Airways - Delayed until 1.12am

8.45pm - Newcastle (T5) - British Airways - Delayed until 1.14am

9pm - Aberdeen (T5) - British Airways - Delayed until 1.07am