I seem to remember the last time we went through Dunkirk we swore never to do so again. It wouldn't be so bad if the baot was direct, but it isn't, you trog down the coast for forty minutes to get to the shipping lane. I went through Calais this summer and was amazed how much quicker it was - I reckon the best part of two hours. If you're a banker from London, of course, you take the Chunnel.