VIDEO Virgin Atlantic A330 flight #VS21 to Washington failed to retract landing gear for a moment after takeoff

On the 18th February 2016, a Virgin A330 (registration G-VRAY) took off around 11:24am bound for Washington. After rotating off runway 27R the airbus aircraft did not raise the gear, and left it down for well over a minute before finally retracting the gear at around 7,000ft.