Tens of thousands of hellos and goodbyes echo through the arrival and departure halls at Heathrow Airport every day, as planes take off and land every 45 seconds.
But for Ehsan Ahmadi and his nephew Muhamed, this is no ordinary day, and theirs is no ordinary hello. The pair haven't seen each other in almost a decade.
Muhamed is just 14 years old, yet he has spent more than a year trying to get here, risking his life more than once on the perilous solo trip from Afghanistan to Europe.
"It was very difficult," he tells CNN. "I passed 12, 13 countries to arrive here, the last one was France, and now I'm finally here."
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