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Everything you need to know should be contained in one of the documents downloadable from the RSTL website here...
https://www.raildeliverygroup.com/rst/where-can-i-go.html
Make sure that you select the guide that is appropriate to the travel facility that you hold.
Based on your limited information of from somewhere in Sussex to somewhere in South East London (south of the Thames) via Stratford International (which is north of the Thames) I doubt that what you are trying to do is valid with a point-to-point ticket to that South East London ticket.
Might...
Extract from the Michael Quick "Railway Stations in Great Britain: A Chronology":
TALLINGTON [GN] op 15 July 1852**; clo 15 June 1959 (Grantham Journal 29 May). Until 1883 Earl of Lindsey could stop
any but Scottish expresses.
You should be able to download a copy of that from www.rchs.org.uk...
I disagree that the easement is only outward journeys starting from St Pancras. The extract I showed is preceded by (and part of):
Off-Peak Train Times to London
If you want to reduce your expenses on your trip to London, consider traveling during Off-Peak hours. These hours usually fall...
That's at odds with what is on the EMR website at: https://www.eastmidlandsrailway.co.uk/tickets-discounts/choose-the-right-ticket/off-peak-super-off-peak-tickets
Travelling Off-Peak from London Monday to Friday
Going out of London – Off-Peak tickets
Off-Peak tickets cover you from 08:47 –...
This is the crucial bit...
"As part of his pre-election pledge, metro mayor of Liverpool City Region (LCR) Steve Rotheram confirmed that a new station at Carr Mill would be part of his commitment to improve the region's transport infrastructure if re-elected"
It's not official policy, he's...
I think that it was shown on Sunday mornings, perhaps on BBC2. Most, if not all, of the incidents it examined, were documented in the classic "Red For Danger" book by L.T.C. Rolt.
The stations I listed are operationally separate in a more specific way than those you are quoting - and have to be treated differently in retail systems to ensure that passenger enquiries see them as one station as a consequence.
Your examples can be joined by another 150 or so