It appears that the hearing was adjourned last month, but will reconvene later this month for both parties to give their closing arguments. March seems like a reasonable bet for them to produce the final written judgment, given that it will need to be very thorough and be carefully drafted given the importance of the matters they're dealing with.
Who knows, and I may be wrong, but I don't personally see an appeal then dragging on for 12 months more or longer. The appeal might not cover all the issues, and in any event the appeal panel doesn't reexamine all the evidence. It will take the facts established in the first hearing and use that same evidence to establish whether the facts in question were properly assessed, whether any disputed points of law were applied correctly and whether any penalties were fairly set.
The hearing will therefore be quicker than the current one, but it still might not be practicable to hold the appeal until autumn given difficulties with scheduling and so on. But the hearing is likely to be significantly shorter than 10 or 12 weeks, and they may well be able to produce the judgment more quickly than the 3 months we're hypothesising for the current proceedings.
This is obviously all guesswork, but it's at least based on a knowledge of similar procedures to those involved in the current case. And based on that, Christmas or early 2026 might not be a bad punt for the final outcome if there's an appeal. Usual disclaimers apply.