It's a long time since I've seen connecting fares advertised, and that was when a single to the coast wasn't much cheaper than a day ticket.
Few of the "connections" are will-timed, now, whereas they used to be mostly very good.
I don't know for sure they're not available, but if they're not and you need to connect both ways, a Scenic Explorer is £10.
Scenic journeys across the UK & Ireland by bus, rail and boat, live timetables, route maps and what to see along the way.
www.greatscenicjourneys.co.uk