How do I use my National Rail Days Out 2 for 1 voucher? We are currently not accepting National Rail 2-4-1 vouchers. Related articles How do I use my Kellogg's voucher online? Is my 2 for 1 voucher valid at SEA LIFE Brighton? Can I change the date/time of my booking? Do you offer a Merlin Annual Pass where you can pay in monthly instalments? How do I redeem a promotional voucher at SEA LIFE Brighton?