Can you not just pay for first part of journey and use MM from Barley Mow and vice versa?
Could do but might be a bit pointless though. I have one of them Go North East bus pass things which makes every single bus fare 90p, no matter how long or short the journey is. May as well just get the bus through to the town regardless in that case.
It might of helped if you'd shared that nugget of information with us from the start.