I filled in and sent in the form two days ago it is very easy. If you booked direct through Euro Tunnel you should get an email as others have done. If you have booked through the Caravan Club/ or other Agent you need to do this well before travelling to avoid hold up at the Tunnel Passport Control when travelling. The Tunnel will send your info to the Border Agency and the Home Office. Details will be deleted after you travel. All details are on the Euro Tunnel Website in Troopers Post below.
Outfit:- Elddis Crusader Storm and Kia Sorento XS.