Completed a questionaire and was awarded as such - seems a generic code:
The code for obtaining your First Class upgrade* is FCJAN2. We will confirm this code in an email to you. To use it please visit gatwickexpress.com or heathrowexpress.com and enter it in the promotion box at the bottom of the order form.
T&C's
The offer is open to customers of Gatwick Express and Heathrow Express who complete the Heathrow Express questionnaire, but not employees (or members of their families) of Airport Express, their agents, or anyone professionally connected to the promotion.
The offer applies to Gatwick Express and Heathrow Express journeys made between 28 January 2009 and 28 March 2009 inclusive. All
tickets must be booked before 28 February 2009. The offer consists of a free upgrade of a standard single or return ticket to First Class on Gatwick Express between London Victoria station and Gatwick Airport and on Heathrow Express between London Paddington and Heathrow Airport when a single or return standard ticket is purchased on
www.gatwickexpress.com or
www.heathrowexpress.com