Originally Posted by
Mr MCO
http://www.gatwickexpress.com/content.asp?SID={691F6846-90A2-4997-95F2-9EC3C1DF4517}&pageid=94
The ticket is valid up to 6 month from date of purchase, but it is only valid for use up to 30 days from the original date booked for travel. Therefore, you can book a December 31 and use it before January 30.
Thanks for this info about Gatwick Express ticket validity.
Sorry, I didn't make clear that my comment about collecting a ticket from the ticket machine up to six months from the date of purchase referred to Heathrow Express tickets. Gatwick Express and Heathrow Express are run by different companies with different terms and conditions. I don't think this 30 day restriction applies to Heathrow Express tickets - I can't find it on their website. It's not in their "Conditions of Carriage".