Does anyone know if there are particular LU stations where Railcards can be
used ?

I'm pretty sure I have used a Network Card at the LU window at Tottenham
Hale to buy a return rail ticket. I got one ticket which had CSN printed on
it, maybe concession ???

The reason I ask is that when I tried to use my Network Card to buy a
Discounted All Zones Travelcard at West Finchley they told me I couldn't.

Any ideas