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After the investigation was completed the UK Airprox report said the incident involved a Boeing 737 leaving London Stansted Airport and a Stansted-inbound Boeing 777 Dreamliner.
It records the controller instructed the "wrong aircraft", leading it to "climb into confliction" with the B777.
The B737 pilot told the investigation the risk of collision during the episode in the skies north-east of Southend had been "medium high". The report concluded the air traffic controller in the London control centre mistakenly transposed call signs and gave the instruction to the wrong aircraft.
The inquiry found at the time of the airprox, defined as a situation where safety of an aircraft is compromised, the "controller's workload was high".
Sources: BBC NEWS, CNS, CAA, AFP
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