I suspect that on Good Friday, the 'short' morning peak 250 from Barton to Hull may not operate - this is the return working from a 255 journey that isn't operating, and unlike the rest of the 250, is operated by Hull rather than Grimsby depot.
It's not ideal on the Stagecoach website when Hull is down as a Sunday service apart from the 350, and Grimsby as a Saturday service. I presume it refers to operating depot, but for the general public if they look for the 250 under Hull they may think it's not operating at all.
Very good spot - would surely be better if they provided a temporary timetable in that circumstance.