SEALINK Stena Line (0233 647047) has launched its budget price Dover to Dunkirk car ferry service which offers savings of up to pounds 60 on a Dover to Calais crossing. A return fare for a car and up to five adults costs pounds 228. The service will be operated by a new ship, Stena Challenger, on selected departures from Dover to Dunkirk on Fridays and Saturdays until 29 August, with return sailings from Calais to Dover daily on three early-morning sailings. A minimum stay on the Continent of one week is required.