Not quite answering any questions but:
in the 1953 WTT I found
Woodford 'F' 7.55 am
Haddenham 9.18 - 9.30
Woodford 'K' 6.45 am
Haddenham 9.38-9.54
Banbury 8.00 am 'K'
Haddenham 10.05 - 10.30
to OOC
Couldnt see any down working though.
In 1949
Banbury 7.15 am only went as far as Brill
But
Neasdon 2.45am
Haddenham 7.32 - 8.08am
Woodford
The station closed in 1963
Dont know anything about catch points but wouldnt the yard exit single slip protect the main lines there? Its not the platform loop at that point.
A bonus for me is that the SRS site allowed the Hadd PDF to download as it is missing on the CD I bought, so thanks for that!
Regards
Peter