Is a Network Railcard valid for East Coast Trains services between London and Stevenage?

I contacted East Coast directly and below is the response:

If a Railcard cannot be produced at the time of purchase or at any ticket examination then the full undiscounted fare will be payable as if no ticket or Railcard were held. In addition to this, a valid Railcard must be held for the full duration of both the outward and return portions of period return tickets

The Railcard is not valid if the holder boards any train without having a ticket when the ticket office was open. In this situation, the customer can only buy the full Single or Open Return on the train with no discount. Accompanying children pay the normal child fare. On pay trains or when the ticket office is closed customers can buy tickets on the train at the appropriate discounted fare. In Penalty Fares areas customers should purchase a permit to travel before boarding the train

Network Railcards are not valid on the following:

• On Eurostar services.
• On any train barred to holders of the equivalent full-price ticket.
• On any shipping or ferry services (except as shown above to/from the Isle of Wight)
• On Rail-Air Coach Link services.
• On London Underground services, including Oyster pay as you go EXCEPT:
  • Off-Peak Day Travelcards (Zones 1-6);
  • Anytime Day Travelcards (bought as part of a ticket to London from outside London Area Zones 1–9)
  • Through Train Company journeys across London on tickets routed ‘Via London'
  • On journeys outside the Network Railcard area.
  • Oyster pay as you go.

The Network Railcard validly map can be found by following the link below.

http://www.railcard.co.uk/clientfiles/files/map.pdf

This discount applies to tickets purchased for travel at or after 10:00 on Mondays to Fridays, on trains scheduled to depart before 10:00 but which actually depart later than 10:00 from the joining station for any reason and on certain trains where an easement is shown in the table or at any time on Saturdays, Sundays and Public Holidays. Please note, the 10:00 Monday to Friday time restriction applies to all ticket types.

The response appears to contradict itself with regards to Oyster PAYG but I hope the other information is of use.

Thanks for your clarification.

Looking at a combination of the east coast, network card, and national rail websites I believed that the restrictions that east coast impose as you referred to are time related.

You linked to this page http://www.network-railcard.co.uk/terms/ which shows that east cost trains might have restrictions, I then reffered to the east coast website which has time restrictions on off peak arrivals and departures from London Kings Cross. http://www.eastcoast.co.uk/travel-information/train-ticket-information/off-peak-ticket-terms-and-conditions/

In your answer to my comment you clarified the query.

The guard questioned the validity of an anytime ticket purchased with a Network Raicard.

Elsewhere on the network railcard website http://www.network-railcard.co.uk/tickets-types-min-fares/ you will see that anytime tickets can be purchased with the discount.

The confusion probably came about because anytime tickets are just that. Valid anytime. However you can get the discount on an anytime ticket, as long as you then abide by the extra terms and conditions that are overlaid by the railcard, in this case the 10.00 am time restriction, and a minimum of £13 fare cost.

I suspect that it is reasonably rare to see an anytime ticket purchased with a Network Raicard, because when you use it, you have already avoided the morning peak so it is likely you will purchase the off peak, or super off peak ticket, all you need to do then is avoid the commuter peak in the evening.

With all the different tickets and railcards that are now available, it's not supprising that the guard doesn't instantly know all the combinations.