Philip
On Moderation
The service is not every 10 minutes now. From December the four fasts between Leeds and Victoria will be on a 15 minute clockface timetable, departing on the quarter hours from each end. The Hull - Piccadilly semi-fast and the stopper will be squeezed into two of the quarter hour gaps. But gaps between the 3tph Leeds departures from Piccadilly will be 37/1/22 minutes!
Even on a clockface timetable, loadings will vary between services, because many passengers want Piccadilly not Victoria and many passengers travel through Leeds or Manchester to the various destinations either side.
The latter point isn't the case anymore; Victoria has more connections to the west than Piccadilly has and is also considered to be in a much better area to go into Manchester than Piccadilly is.