The way I see it from Saturday, the incident occurred after some serious delays, so the 1400 off Cardiff was canceled, and I presume the crew/unit was transferred over to the 1500, hence their printed diagrams was probably for the 1400 and not 1500, hence them emitting Pilning accidentally. Props to GWR, once told about the issue, Patchway staff soon arranged a taxi to pick up the 3 passengers (2 enthusiasts, and 1 actual passenger) from Pilning, no taxi was required from Patchway to Pilning as no one was requiring to get off.