Totally this thread sums up the difficulties in trying to compare Pre and post pandemic, too many variables for direct comparison. Avanti and transpenine need to be discounted as a start as they're not running even similar timetables. Across the board TOCs aren't running Pre pandemic timetables and obviously overcrowding isn't as predictable as before as working patterns have changed and I still don't think future work patterns are settled.
Indeed, even a single strike days within a month is going to alter flows, by how much is hard to predict.
Rail use is always going to be slower to return then road travel.
Whilst still inaccurate comparing rail use by year had advantages. For example a 15% fall in rail passenger numbers sounds like the industry is potentially in a dire straits. However saying passenger numbers as it was in 2019, shows that it's fallen, however, to a point which wasn't that alien to most that it's not outside their lifespan (i.e. unless they are still in full time education they are likely to be able to remember something about that year).