Can't say whether it was easy to miss or not, since er... I missed it. ?
Anyhow, I might try to phone the Ticket Office with my Booking Reference when they're likely to be a bit quieter, to ask which type I've booked.
That's helpful - I booked 118 (not the Family part), so I may be ok.
That said, it seems strange to me that one block is digital and another is paper. Why segregate like this? Why not ask, in a manner which is obvious ?, what the punters prefer, regardless of where they wish to sit?