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At Heathrow's Terminal 5, the queue to re-book cancelled flights with British Airways stretches almost the entire length of the terminal building.
One family, about three-quarters of the way up, said they had already been waiting an hour and a half.
They were due to fly to Frankfurt this morning but their flight was cancelled. They don't know whether they may be able to get on a flight tonight or have to wait until tomorrow morning.
Airport staff are moving through the queue handing out bottles of water.
Despite the disruption, and the huge number of frustrated passengers waiting for news, there is a surprising calm in the terminal as people wait patiently to discover if and when they will be able to leave.
Thousands of people have been affected after a technical problem at an air traffic control centre caused chaos at airports across the UK.
- Heathrow cancelled 217 flights so far today
- Gatwick cancelled five flights but experienced 86 delays
- Stansted said flights had been delayed by up to three hours
- Other airports affected: Dublin, Cardiff, Belfast, Glasgow, Edinburgh, Bournemouth, Manchester, Birmingham, Southampton, Luton, London City, Exeter and Newcastle
- The National Air Traffic Service said the disruption has caused a 20 per cent reduction in flights handled
- The company said the issue would not be fixed until between 6.30pm and 7pm
There have been 217 flights cancelled at Heathrow Airport today as a result of a technical problem at an air traffic control centre.
Passengers were forced to join long queues at Heathrow Terminal 5 as a technical problem at an air traffic control centre continued to cause chaos at airports across the UK and Ireland.
Communities affected by the most serious tidal surge in 60 years along the east coast of Britain have been warned to avoid direct contact with floodwater and beware of rats moving into homes.
A major clean-up operation is under way after the Environment Agency (EA) said 1,400 homes were flooded, including 300 in Boston, Lincolnshire, alone.
In Suffolk, police said there was no further threat from coastal flooding but local authorities warned that people should take precautions around floodwater including preventing children from playing in flooded areas or with contaminated toys.
Those affected were also advised to discard food grown in allotments or gardens and store rubbish out of the reach of pests.
A minute's applause has been held in honour of former South African president Nelson Mandela ahead of the Premier League game between Manchester United and Newcastle United.
The former South African president died at the of 95 on Thursday.
All Premier League and Scottish League games will pay a similar tribute this afternoon.
Technical problems at NATS Swanwick air traffic centre likely to be resolved in 6 hours >> http://t.co/6gCCjBvuqk
The fiancee of David Traill, who died after the helicopter he was flying crashed through the roof of a Glasgow pub last week, has paid an emotional tribute to him.
Captain Traill was due to marry his partner, Lucy, whom he met on a blind date almost five years ago.
She said David Traill "seemed too perfect" as she got to know him and learned about his passions - cycling, Scotland's west coast, fine dining, kayaking, Take That, and, "best of all", karaoke.
"It all seemed too perfect but there was no catch. He just adored me and told me every single day," she said.
"I knew Dave only for four years and nine months and three days, but they were all precious.
"He was the most amazing, caring, loving, strong, capable, funny, creative, delicious and sexy boy in the whole world and I cannot even begin to imagine life without him."
Mourners sign a board of condolences outside Nelson Mandela's former family home in Vilikazi Street, Soweto.
The father of a pilot killed in the Glasgow helicopter crash cried as he read a poem in his son's memory during an emotional service at Glasgow University today.
Around 700 mourners, including friends, family and former colleagues, attended the funeral of 51-year-old David Traill who was one of nine people killed when a helicopter crashed though the roof of the Clutha bar last Friday.
Ian Traill sobbed as he read the David Harkins poem You Can Shed Tears to mourners.
The widower had read the same poem at the funeral of his younger son, Angus, three years ago.