They couldn't have got to Chinley on Saturday until gone 1030, 1L05 was in the way with over 100 people on board so there was no way to get a train past it to turn back.
Indeed, I'd quite forgotten about 1L05 being there. Still, 1L05's existence wouldn't have been an impediment to running a 1055 Chinley - Picc, or a 1003 New Mills Central - Picc.