I've already booked the chunnel, however I was sent this as an ex-speedferries user. Seems a good price! hope it's useful....
quote "The Travel Market has teamed up with low cost ferry operator Norfolkline to bring you this amazing, fully flexible deal on all Dover-Dunkirk sailings up to 17/12/09.
There are just two fares to choose from: High season (03/04-19/04 inclusive and 17/07- 06/09 inclusive), or Low season (all other times excluding High season), and the price you see is the price you pay whether you choose a day, night, peak or non peak sailing within a season. There are no amendment fees so you can change your booking, subject to availability as many times as you like, but you must book your crossings by 18 February 2009.
Terms and conditions: Book by 18 February 2009 for travel up to 17 December 2009. Bookings are non-refundable and subject to availability. No amendment fees apply. Fares increases will apply and be charged when amending sailings from low to high season. Fares quoted include fuel surcharges. "