FWIW the
EFL website says this:
If the points deduction was handed down during the Normal Playing Season but prior to 5.00pm on the fourth Thursday in March, the points deduction would apply immediately (12.3.1).
If the point deduction was handed down after the Normal Playing Season has ended, the points deduction takes effect from the start of the next season (12.3.3).
If the points deduction is handed down
after that date in March but
before the end of the Normal Playing Season, the points deduction would only be applied
if it meant the team would be relegated:
Rule 12.4.2: "Where the circumstances set out in Regulation 12.3.2 apply and at the end of that Season, having regard to the number of championship points awarded (
ignoring any potential deduction):
the Club would not be relegated as aforesaid, the points deduction
will apply in that Season and Regulation 10.1.2(b) or 7.7 (i.e. relegation from that division) will then apply (if appropriate) following imposition of the points deduction."
The
Normal Playing Season is "the period of the year commencing with the first League Match and, for each Club, ending immediately after the completion of the Club’s final fixture of the League Competition,
excluding any Play-Off matches."
I'm not sure what an Insolvency Event is, which is what the points deductions referred to in these provisions relate to, so the rules may be different for a more minor breach of FFP. But, assuming the Derby appeal was rejected before 230 PM on Saturday, it does seem like Wycombe might, annoyingly, have a leg to stand on.