Steam Boat Tea Cruise for Two - Key InfoVoucher Validation Your voucher is valid until 01 Nov 20 You must validate book and use your voucher within the voucher expiry date.Duration: This experience will last approximately 2.5 hours.Group Size: This voucher is for two people.Weather Dependent: YesSpectators: This experience is not suitable for spectators.There is no minimum age for this experience however under 18's must be accompanied by an adult.Availability: This experience is available on selected dates from 2nd May to September 2nd. Please note 2019 dates are now fully booked.