I've been asked what's the busiest unstaffed station on the national rail network. Network Rail station categories F1 and F2 are supposed to mean unstaffed but there are exceptions, e.g. Filton Abbey Wood, which I believe has a ticket office. Many staffed stations are unstaffed in the evenings and on Sundays but what's the busiest station with no staff during the working week? Any advance on Saltaire, which had 887,000 entries and exits in 2019/20?