There are two four-car diagrams Mon - Fri down the Hope Valley in the evenings. One set works the 16:49 Man Picc - Sheffield, 18:14 SHF - MAN, 19:49 MAN - SHF and 21:14 SHF - MAN and the second set works the 17:49 MAN - SHF, 19:14 SHF - MAN, 20:49 MAN - SHF and 22:47 SHF - MAN.
Since the new year it's produced 142s quite reliaby but I'm getting them in while I can as it's got to be almost over now.
Starting from Sheffield and with trains on time it's possible to do the 18:14 to Bamford, then the 18:42 back, the 19:14 from SHF to New Mills Central then the 20:17 back to Sheffield: all 142s on a good day. A Derbyshire Wayfarer covers all this! I hope this helps, Kev.