To add, if Harry loses, then Sarah Phillimore and 'Miss B' will proceed with their own similar case, but this time focusing on Article 8.
From Sarah's article:
I have a very personal interest in this as I have my own application for judicial review against the same guidance, as I am recorded as “a barrister posting hate” by Wiltshire Police – which doesn’t strike me as very “neutral”. My case will be based primarily on breach of Article 8 and data protection laws, issues which were frustratingly touched upon before the Court of Appeal but not canvassed in any depth.