From memory I think there was a evening parcel train that ran from Redill to Preston that often had a 33 to Oxford or further north.
They were not unknown on cross country passengers either.
Loved the TOPS film is that not, Mike Goosey who worked at St Blazey tops and also shown the lady at Truro Travel centre , don't know her name. For the record here's that link again.
Cheers Roger Geach
Ramsgate to Paignton
1st left unknown, 2nd left Jack Strike, 3rd left nickname "Gulch", blacksmith, 4th left Syd Bishop, 5th left unknown, 6th left Oswald Sandey, far right Tom Merryman.
Hope this is some help to Martin Duff/Tony Wright.