*Whilst that would be a given, never underestimate the spite of officials scorned. Assuming HM is awarded judgement, be prepared for an insta-appeal from the CoP (they've probably already completed the forms). And should that fail, be prepared for moves to take it to SCOTUK. And if that takes months, maybe a year or more, of worry, stress and uncertainly for Harry, so much the better.
It's nothing personal. Nobody is allowed to tweak the nose of power and get away with it.*
Now that you put it like that it seems obvious. Nothing for it but to keep PULLLING.