He's not suing.
He's seeking a judicial review in to the decision making process,
That won't remake the decision, but will look at whether RAVEC had the power to make decisions of this sort, whether it is fit for purpose in terms of things like appropriate membership, does it receive the right information in a timely fashion, do the procedures mean the information is properly considered (especially if classified and therefore cannot be taken away from secure systems - inc how did that work during covid), anything else about the committee and its procedures.
We don't yet know how much will need to be in camera, because it will include material from the security service on threats, and how that information is handled.
The JR will decide if existing processes are fit for purpose and are being properly applied. If not, then changes must be made and and decisions taken during a period when there were identified weaknesses may have to be re-considered my new fit-for-purpose decision-making body.
That won't be in time for the Service of Thanksgiving on 20/93, and probably not for any of the summerJubilee events.
What I can't remember is the outcome of the first stage of this - the court action that formally commissions the JR and sets its terms of reference. I'd seem that it had started, but has that partncincluded?