Thank you both for your most helpful responses.  Regards

Hello
I am planning to walk the Oxford Canal this summer / autumn on Sundays. I see from the timetable at Tackley station that there will be no stopping services on the line from Oxford to Banbury and return after September 17th 2017. This is confirmed by the GWR^▸ (Great Western Railway) timetable but provides no explanation. Does anyone know if this is permanent or a temporary change due to engineering work ? GWR used to make much of this line and did offer an Oxford Canal rover (posters to this effect still on display at Tackley)  but there is no longer any reference to this type of ticket I can find on the GWR website. Thank you.