Thanks. The note includes:Am also curious about this, both for that date and how useful the figures are in general. The methodology note hasn't been updated for some time (despite showing as updated whenever the data is) so it may have changed since, but the data quality for the National Rail section has some big caveats including seemingly based on when tickets are sold than used:
By contrast the TfL numbers are calculated based on entry/exit and bus taps which may explain the difference on that day.
Thus season tickets are not allocated, but count as "around" 480 journeys on the date of purchase (for an annual). Given it was a strike day, I find it difficult to believe that anyone (or at least more than a very few people) bought a season ticket that day.
- Journeys in LENNON are estimated based on the date of ticket sale, rather than the date of intended travel. This includes journeys made with season tickets, which would all be recorded as being made on the date of the ticket purchase. There is therefore a risk of overestimating the number of journeys for season tickets and advanced tickets on a given day (and conversely underestimating them at other times)