Brittany Ferries Cruise & Dining Voucher ?

Will leave London shortly, and not able to redeem it. This voucher entitles you and three guests to a ferry trip with Brittany Ferries from Porthsmouth to St. Malo and back. It includes a free lunch. The value of the voucher is over 400 pounds, butt here is a port charge of 30 pounds per person. Price negotiable.