Journeys from/to North Staffs to Nottingham have always been fairly strong anyway (it was a pretty well timed change at Derby to/from XC), of all the routes it's probably got the most suppressed demand opening up now the 153s are gone - full and standing 2 car trains are now not unusual. There's a lot of Nottingham/Beeston - Preston/Scotland traffic appeared too rather than using the Nottingham - Liverpool route and quite a lot of Nottingham - Manchester traffic with with good connections at Stoke.It's a shame because although arguably there's greater potential for the North Staffordshire stations, plus the Potteries and Crewe to have through services to Nottingham, the market for local travel from the Matlock branch stations is much more mature. It's also very frustrating that connections for journeys like Duffield to Nottingham aren't better. The through services from Crewe of course weren't available before the pandemic depressed overall demand so they've yet to have a proper opportunity to ramp up.
Ideally they'll both be back and my first reaction was that Derby - Crewe should be the shuttle however it's not all that simple, I suppose.