I have to agree with
@3595wilk there seems to be a bit of a misunderstanding amongst shooters of what a JR can achieve.
It’s not a process where, if you can convince a Judge that your position is the better one, the Judge has the ability to strike down a government action you don’t like.
It’s a method of challenging whether a government action, taken under existing legislation, is permitted by that legislation. Primarily, that’s done by arguing that the action isn’t available to the government under the legislation or, even if it was, the government was mandated to follow a process before taking it, which it failed to do. Establish either of those, and the Court can overturn the action (but the government can go and do the same thing again following the proper process, if that’s an option). There’s also scope to argue a decision is so unreasonable no reasonable decision maker would take it, or that it was taken for an improper purpose - both of which might come into play in relation to an increase in fees that isn’t justified on the cost of the exercise or is intended to discourage applicants.
The British approach of full costs recovery, based on an average cost, is not going to be ruled unreasonable or improperly motivated so, as long as the government followed the correct process, it’s not vulnerable to JR.
If the NI approach (I haven’t looked) had no relation to the cost of administration and was significantly more than it, there may have been scope to argue it was unreasonable or improper. Similarly, if they hadn’t consulted properly, that might have been a problem.
However, this is unlikely to be the end of this. The government can simply launch a proper process and make the increase appear more reasonable, such as by linking it to costs of administration, and it’ll get that through.