Agents can save their clients up to £58 on a return crossing with Stena Line during National Ferry Fortnight, which runs until March 19.
Passengers can invite two friends or family members to travel for free to Holland when they book a car and driver fare, with the two friends/family members being either children or adults (children up to four years travel free).
The deal means that a car driver with two friends or family members, in one car, can travel from Harwich to the Hook of Holland for £98 return on a day crossing, saving up to £58.
The offer is valid on new bookings made by March 19 using the code FF16, valid for travel until December 31.
The ferry company offers twice-daily, seven-hour return crossings between Harwich and the Hook of Holland. Return foot passenger fares for adults start from £73 per person and a return crossing for two adults with a car start from £127.Cabins start from £15 per person each way.
For full terms and conditions or to book see stenaline.co.uk/free or call 0844-770 7070.