A lack of space to land planes at Heathrow airport is costing the UK up to 14 billion pounds a year in lost trade. A new report says the figure could rise. Bosses at the airport have been pushing for a third runway but government officials have ruled it out for the time being.
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It follows a multibillion-pound restoration of the former electricity generator, which has stood unoccupied for decades.
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The mayor said a post-Brexit visa system was needed to maintain the supply of skilled migrant workers for London's economy.