P & O Ferries are offering 20% off Dover to Calais crossings booked between 4th July to Sept 30th. It excludes certain dates in July and August. Ive just booked a two week trip 14th to 28th Sept out at 10.15 am and back at 12.35pm. for £75. Also included is a £20 food voucher for outward trip. Looks a good deal. The promotion code is 20VH3.