Heathrow Airport chief executive Colin Matthews says: "We say a hub (airport) matters but actually does it matter to the country as a whole?
"The economic analysis we published today suggests it really does."
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Police say they have traced four drivers who are thought to have hit the woman, and added that a fifth vehicle may also have been involved.
Police are trying to trace two men after two homophobic attacks on gay men in Walthamstow
Two London Boroughs make it into the top 15 places to live in the UK.