Sorry if this has already been covered, but just having a look on RTT, Northern appear to have made the Hope Valley services hourly, but then introduced some skip-stopping. For example, one train (15:45 Sheff - Man) runs Sheffield - Hope - Chinley and then usual service to Manchester. I must question who is going to be using this between Sheffield and New Mills - Hope and Chinley don't supply a whole train, nor does eastern Manchester from Sheffield, and anyone going all the way would use the fasts. I assume this has been done to allow for freight, but it does seems odd. The same goes for the 13:14 (Sheff - Man), which skips Dore and Edale for no discernable reason.
Equally, going the other way there are two skip-stop trains (19:49 and 21:19 Man-Sheff), one of which skips the entire Hope Valley, the other skips Edale and Grindleford. Surely having 4 skip-stops per day which skip different stations will just be unnessesarily complicated. It leads to changing times every hour, and surely it will lead to people boarding a train to a stop at which it doesn't call (in particular from the stations without any DMIs or announcements).
I know it's in the best intentions of squeezing in as many trains as possible, but this doesn't strike me as the best way of doing anything!