Try http://www7.stenaline.nl

"Two new ferries were introduced on to the Harwich-Hook of Holland Route in late 2000 and early 2001. The Stena Britannica sailing overnight from Hook of Holland to Harwich and the Stena Hollandica sailing overnight from Harwich to the Hook of Holland. The new ferries have excellent facilities. They are predominantly freight ships but there is also limited space for car traffic on evening sailings, ideal for passengers who find it more convenient to travel overnight. Full English breakfast and evening meal are included in the cost. Onboard facilities include a cinema."

Gareth