I'm traveling with my niece, who will have an under 18 ID card that should get 1/2 price transport prices. I heard if you buy a paper 7 day travelcard from a rail station (would Heathrow have one? or is there a list), you qualify for the 2 for 1 admission to several places. Normally, I get a 7 day travelcard loaded onto an Oyster Card. But I'm interested in any experiences folks have with the 2 for 1 offered by the rail folks. I already registered, but not sure how to get the paper rail ticket/ tube 7 day travelcard (I'll be in London zones -1-2 mostly...other than a trip to Windsor and the trip in/back to Heathrow.
Thanks!