One giveaway indicating that a departure is being investigated for a height infringement is that its details have been suppressed on Heathrow's WebTrak system.
That's what happened with the infamous Jet Airways B77W departure in August 2016. It was initially shown on WebTrak, but subsequently it disappeared from the public system and failed to reappear within the 1-year window.
As of today, UA935 is still visible.