What does one calendar month for a return train ticket mean?
Because of the way rail ticketing works, you can start your return journey up until 2:30am on the 28th of October. Of course, doing that, you’re unlikely to find many trains at that time of the morning. 😉 An extension to that being that, if it is not possible to complete the journey before this time, travel is allowed until 12:00 on the day following the last day of validity provided that there is no further break of journey. However, London Underground do NOT honour the extension for cross-London transfers. As for “Off-Peak”, it depends on the journey being made. An Off-Peak Return from London to Banbury, for example, is valid by any train from London Marylebone, but an Off-Peak Return from London to Manchester isn’t valid before 09:15, nor between 15:15 and 18:11, from London Euston.