Mark Mac, We went Dover/Calais last year, 7.65m Van and Renault Espace. We booked the ferry crossing through the CC and the all in cost for 2 adults and 3 children was
Where are you starting from. We have travelled the last 2 years with Norfolk Line Dover to Dunkerque. 4x4, 7.2 metre van and as many passengers as the car will carry (up to 9 I think)
Look up the websites for the ferry companies, or a webpage with several. Punch in your outfit and dates and you will get a quote. Play the dates and see the difference.