Travelcard question
I have a travel card and has saved me quite a sum of money over time. I normally use it when I take the fast train from Ashford to St Pancras then tube from Kings Cross to LHR. I get my ticket from the agent at Ashford for travel all the way through. This time my journey will be in reverse. Should I just use my Iphone ipay to get a one way tube fare from T3 to Kings Cross, walk across the street and use my travelcard to get a discount on the fast train to Ashford Int'l or should I see a ticket agent at T3 and have them ticket it all the way through? I would imagine the ticket booth at T3 underground is probably stalled with a long long all the time.