https://www.thenationalnews.com/news/uk/2025/07/30/london-airports-suspend-after-radar-outage/
Flights at London's major airports were grounded or diverted on Wednesday after a significant air traffic control fault hit air traffic control.
Radar systems went down as the authorities investigated a potential glitch in the systems serving the London Control Area, according to Eurocontrol.
Heathrow and Gatwick airport said take off and landing had been suspended. Within minutes passengers were reporting knock on effects of widespread delays and cancellations affecting flights.