On 10 October 2015, a Britten-Norman BN2 instructed to join final behind a Boeing 767 instead joined in front of it which obliged the 767 crew to make a go around. The Investigation was unable to establish why the BN2 pilot failed to follow their conditional clearance but noted that the 'follow' clearance given onto final approach had not been accompanied by a sequence number, and when giving the aircraft type to be followed so that its sighting could be reported, the controller had not challenged the incomplete readback or repeated the aircraft type when subsequently issuing the clearance.