I'm trying to book tickets to KGX as part of a longer Journey to Bristol. The plan was to Book Darlington to Kings Cross and back, and use a Rewards Ticket for one of us, but the system wont let me. So I tried doing a Single Journey to Kings Cross using the Rewards Ticket, But again it wont let me, it has to be part of a return trip. The planned Journey is DAR to KGX, KGX to BRI. Two Adults with a DSB card, Travelling out Friday 3 July, Return Sunday 5th July. Is there antway we can do it and still use up the Free Rewards ticket as part of the journey?