Any ideas on the recommended routing between this station pair?
Fare on the default route is £3/£2, and £5.60/£3.60 on the alternative route via Marylebone
Difficult to see how to avoid Marylebone. There is a theoretical journey with 4 changes at Hayes and Harlington, West Ealing, Greenford and South Ruislip, but West Ealing to Greenford only runs at limited times so unlikely to meet the criteria of a default route. And it’s so convoluted that it’s probably no quicker than via Reading and Oxford.