To be fair the all year Sunday service and early morning one were addressed in the latest franchise round, after that - well Whitby isn't that big a centre of population and transporting more drunks back to Teesside is hardly a rationale for a later service to Smoggyland, look how bad the late Saturday service is for trouble already.....
It's hardly what I would call a comprehensive service through the day though. Three hour gaps galore.
I've often seen trains full and standing throughout the whole length of the route (and if the rowdies could be pushed onto a later train, the rest of us could stay there later than 16:00).