When I check NRE for fares for a day return from York to Carlisle on Saturday it shows a North East Round Robin to be the cheapest ticket. I need to do both the outward and return legs via Newcastle as I'm meeting somebody. NRE still said this was the cheapest ticket. However under the ticket description it says it is valid for a circular journey on the East Coast Main Line and the scenic Settle & Carlisle line. So it seems unclear whether it is valid to return via the outward journey route, even though NRE journey planner shows it to be valid. Anyone know for sure?