Idly looking through what I could get with Tesco vouchers, when saw that DFDS now offer 3/1 rate on Dover-Dunkirk. Looked good, but browsing the reviews brought up this caveat that seemed worth sharing here: "Beware! Read the T & C's very carefully. You can can only use this offer for cars. No vans, campers or trailers. Found this out to our cost. Now have a £90 token we cannot use!"