Ok, thanks for the info.
Welcome to the forum, Andy E.
11th September is the very last weekday before the next timetable change ... there may be a couple of others a week or two earlier relating to school traffic, and train diagrams are only planned at quite short notice. Very fluid situation. Others may have more insight than I have.
On line service at Real Time Trains showing I suspect incorrect data for 11.9 ... for tomorrow (11.
and I would take an educated guess until 15th September, direct trains from Tiverton Parkway to Redruth ...
06:35 and 07:52 - operated by "West" fleet so very likely
HST▸ (Castle)
11:57, 15:58 and 19:03 - from Paddington, operated by
IET▸ 17:29 - Cross Country service,
almost inevitably a voyager, but technically an HST (not a Castle though) could turn up, I suppose