There are a few places you can find your booking reference.
You’ll find the booking reference in the subject of your confirmation email.
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For all bookings, both etickets and paper tickets, you can find the booking reference at the bottom of the ‘Ticket details’ screen.
If your booking is for paper tickets, you can access your booking reference directly from the ‘My tickets’ tab list of tickets and from towards the top of the ‘Ticket details’ screen.