So much for the BAA stating LHR was "fully operational".
From The Independent online:
British Airways grounded all its flights out of Heathrow until at least 5pm this afternoon, despite the airport's operator saying it is "fully operational".
A spokeswoman from the airline said: "The weather at Heathrow now is quite appalling."
"We knew that severe weather conditions were expected, so rather than asking passengers to travel down from Scotland, for example, just to have their flight cancelled, we think it's better to tell all our customers that flights are cancelled.
"We need to give our customers some certainty."
She said the airline regretted inconveniencing passengers, but insisted it was the correct decision.
"This costs British Airways a huge amount of money, so this is not a decision we take lightly," she said.
"There's a backlog from yesterday and that has an impact on today's customers.
"The main thing is we don't want customers turning up today to get stranded and not be able to get out by car or by plane. "
Winter blast brings Britain to a standstill - Home News, UK - The Independent