The calculation is more cumbersome than usual because the mileage for part of Whitton - Waterloo via Hounslow is not shown in the National Rail Timetable.National Routeing Guide in Detail page F9
Journeys on direct trains or taking the route of shortest distance or a distance longer
by no more than 3 miles are always following a permitted route. Journeys following a
route given by the Routeing Guide are following a permitted route.
Your confusion is due to the fact that much of the National Routeing Guide is poorly written and, in places, it is contradictory.I thought that the three mile rule only applied where origin and destination had a routeing point in common.
But the statement at the bottom of page F9, which I quoted above, makes it clear that this applies whether or not there is a common routeing point.National Routeing Guide in Detail page F7
If there is a common routeing point, the permitted route is the shortest route or a route which is longer by no more than 3 miles.
Well that's just daft. Next time go armed with a screenshot of the National Rail site, which says:Well I went today to get the ticket from Whitton Station. Staff there said that via Hounslow is not allowed, even on the direct train.
and a screenshot from the NRE Journey Planner showing a Whitton-Waterloo journey via Hounslow/Brentford, which clearly shows only one ticket is needed (and costs the same as the train via Richmond).NRE said:Whitton London to London Terminals
Available Standard Class Adult Season Tickets (Travel is allowed by any route option shown by the Journey Planner where the journey can be made using only one ticket.) ...
"Internet research"? The Internet is merely the method used to access the information, and is irrelevant.I tried debating and he said that his 10 years of experience and training account for something against your internet research.