If the Director really wants to know the answer to his question, all he has to do is pick up the telephone and call the respective airline OPS department.
The crew in the concerned aircraft does NOT owe any explanation to ATC, and the Director should know this. ATC has the responsibility of providing positive separation, not to engage in "question time".
Have noticed over the years that the LHR ATC controllers, although very talanted at their job, continue to question and are otherwise sarcastic to some crews. Would suggest that these controllers pick up the phone for their answers. THEN, if they don't like the replies, ask here.
It's called mutual cooperation.