Just a thought for the New Durham Bus Station, would it be a good idea to the have the Buses enter the New Bus Station via New Street, which is the side street which runs Parallel to the current Entrance to the Bus Station, and for that to work, you'd have to dig up the Pavement to then open up that Street on the A690, so Buses can Enter.

I would then have Anglian Home Improvements which is on the Corner of the Entrance to the Current Bus Station relocate elsewhere within the City Centre of Durham, so that Building can be knocked down, to further open up more Space for the New Bus Station.

And then Knock Down the Methodist Church and the Current Bus Station in Stages whilst the New Ones is in Development, Only way off top of my Head that I can see Durham Council moving the Bus Station closer to the Roundabout.