@Signalbox
Is the High Court precedent setting? Hopefully this will save others from prosecution for unkindness.
The simple answer to your question is yes, but there is something that is quite confusing about this.
The original conviction was at a magistrate's court.
The normal route to appealing a magistrate's court decision is to go to the crown court but you can also go straight to the high court for a decision "by way of case stated" which is where you're simply appealing that the magistrate got the law wrong.
However, there is a quote included in the Daily Mail article linked to earlier where some one from the CPS is quoted as saying:-
A spokesman for the Crown Prosecution Service said: 'Following today's Court of Appeal decision in relation to the conviction of Katherine Scottow, we await the judgment which we will consider carefully in due course.'
(emphasis added)
If the quote is correct that is a bit odd as you don't just jump from the magistrates court straight to the court of appeal.
There is a means by which you can get to the court of appeal though. That is to first appeal to the crown court and from there (if still not successful) then appeal to the court of appeal.
It seems as though she may have had an unsuccessful appeal to the crown court which she then took to the court of appeal where she was successful.
It all depends what was said in the judgment but a court of appeal judgment is binding on all lower courts unless a specific case can be distinguished as being different in some concrete way from this case.