Planes have been grounded at some London airports due to a technical failure. The UK air traffic authority says it is limiting the number of aircraft flying in the London control area to ensure safety. The issue is a result of a technical issue at NATS Swanwick air traffic control centre, it added. Both London City and Gatwick airports have said the air traffic control issue is affecting departures. Read more on the Sky News website: https://news.sky.com/story/uk-airports-latest-flights-