I just saw G-YMML (operating as BA 199) execute a missed approach and make weird circles. What is happening here? (FlightAware permalink)
Perhaps the aircraft went missed approach because of an unsafe gear indication or flight control issue and the crew wanted to try and rectify or troubleshoot the issue and was given that general area east of the airport and away from the normal traffic flow to work the problem (doing 360 turns in process).
Difficult to say for certain.