Found the detail on the virgin website
"Book
Virgin Atlantic flights now, with the flexibility to change for free* later
We understand that booking long-haul travel at such an uncertain time may feel difficult, so we introduced some changes on 14 February 2003 to make booking travel an easier decision for you.
Book and buy your Virgin Atlantic flight now and if, due to the Middle East crisis, you later decide that you want to change your dates, push your travel plans back, or even change your destination, we will make the changes at no extra cost*.
This applies to all existing and new bookings (including flying club reward bookings and to MilesPlusMoney bookings) made in any class on or before 08 April 2003, for travel between the UK and the USA, Hong Kong, Shanghai, Tokyo and Delhi.
We will not charge for the change of booking or for reissue of the ticket at a later date, and would ask that you retain the original tickets to be used as credit towards your next journey with Virgin Atlantic. If you made your booking direct with us (via telephone or our website) please call us to make the changes to your booking on 01293 450 150. If you originally made your booking with a
travel agent, please refer back to them for any changes.
All changes must be made by 31 May 2003 and at least 72 hours prior to the original departure date. All travel on the revised itinerary must be completed by 31 December 2003. If your change is to a more expensive flight, then you will need to pay the difference in fare. If your change is to a less expensive flight then we will of course refund the difference.
Terms and Conditions for changes/cancellations
Reservations may either be cancelled and tickets used as credit towards future transportation, or reservations may be rebooked for future dates.
*The passenger will be charged for any difference in fare due to changes in taxes, route, more expensive travel period (i.e. Summer/Easter/ Christmas), day of week (i.e. weekend), higher booking class or cabin.
Refunds will be given where the change results in the passenger traveling in a lower travel period, day of week, booking class or cabin and where taxes have reduced in price.
All changes/cancellations must be made by 31 May 2003 and at least 72 hours prior to departure.
This policy applies to Virgin Atlantic codeshare flights where the ticket/flight number is pre-fixed VS.
This policy applies to partly completed travel itineraries (e.g. first leg completed but changes required to return trip).
All advance purchase/minimum and maximum stay requirements must be adhered to.
All other restrictions/conditions remain unchanged.
The names of passengers must remain the same as the original tickets.
Any passengers who no-show for a flight will not be eligible to re-book under this policy.
All changes to dates/destinations are subject to availability"
hope this is of some help