请问，London Travelcard可以在希思罗机场单独购买吗

http://www.londontravelpass.com/

You can purchase your London Travelcard from any Underground Station or purchase online at http://visitorshop.tfl.gov.uk/

http://www.londontravelpass.com/prices.html

可以 票价要看几天 还有peak 还是off-peak 记得1day off peak 是9.8磅好像

yes
should be same price everywhere

可以，当场买当场可以用

可以，当场买当场可以用