Okay, I got an answer back from HEX today and the code has now changed.
Thank you for your recent email regarding the problems you've been
experiencing making your Heathrow Express booking using the current Virgin
Flying Club promotion. Please accept my apologies for the delay in
responding to you. We were unaware of any problems with this promotion so I
have been looking into this matter.
I can confirm that this now has been rectified, as this promotion should be
running until the end of June 2007, so you should have no more problems
making your booking. For your convenience here is the link you'll need
http://www.heathrowexpress.com/index...omoCode=VIRG25. Please do let me
know if you experience any more problems.
I'd like to thank you for taking the time to let us know of these issues,
and again my apologies for the inconvenience this has caused you.