From my reading it seems they did not have the prerogatives or rights to ask this, it was an illegal demands but the apology was enough.
> IPT secretary Susan Cobb wrote back to say: "It was inappropriate for your staff to seek to intervene in ongoing legal proceedings..."
> Lord Justice Singh told the room: "The tribunal's secretary acted entirely appropriately in responding the way she did and by drawing these matters to my attention. In March 2019, it was recognised that the direct communication was inappropriate."