A seven a.m. departure from Dover, a UK sea port, will have you across the English Channel in France’s Boulogne just over an hour later, giving us just sufficient time to freshen up, take in a coffee (and a patisserie) and plan our morning. This ferry service is run by LD Lines which delivers its passengers to the quay at the foot of Boulogne’s town centre in just over an hour (midweek crossings are cost …