You can redeem your National Rail 2 for 1 voucher online when visiting the Days Out Guide Website. Please follow the instructions to complete your booking for SEA LIFE London. On the day of your visit, you will need to present your train tickets, booking reference number and payment card to fully redeem the offer. Please see the Days Out Guide Website for further information regarding the terms and conditions of the offer.
Please make sure you are using a valid train ticket for this offer by visiting here