If they've heard about the recent FCC situation with tickets via St Albans City, they might have suddenly thought they'd found a similar 'loophole' - but it's good that they did listen and let you go.
There's no harm in staff not knowing absolutely everything, especially if they cover a huge area (Liverpool Street to King's Lynn one way, and off in other directions too) but it's what they say and do that matters.
This isn't as clear cut as you make out. Some TOCs have been prepared to put it in writing that they would allow such a thing. The rules aren't clear at all here. It was discussed in previous threads without consensus.
However I don't suggest writing to GA about this as using the ticket via Cheshunt would be seen to be a loophole which could see the ticket withdrawn from sale sharpish
Does it have to be NRE Website?
RSH will do it.
From London Liverpool Street
To Theobolds Grove
Via Cheshunt
Timetables only
then show trains calling at Stratford
I thought we had covered that Stratford was more than 3 miles off route.
Can the three mile rule apply more than once in a journey then?
It's not three mile deviation off a route as such: you need to calculate the shortest route in miles (by reference to the left hand column on the timetable pages) then calculate the mileages of your alternative routes (the same way). If one is 5 1/4 and the other 8 1/4 then you're fine.
Had another questioning tonight, the gate line lady had been told not to accept anything that didn't say Cheshunt on it.