Instructions:For longer breaks of 6 days or more on the continent, this online discount will save £5 off each leg of your booking - that's £10 off a return journey.
This discount applies to all Dover-Calais sailings up to the 15th December 2011 and there is no limit to the number of bookings you can make. However, bookings must be made before the 28th May 2011.
Use the below link:
Or type: "5gbpoff" into the promotion code box