Going back to the 4 discussion after Michael mentioned issues yesterday.

Just drove from Gateshead to the Galleries, passing Heworth.
As it's the quickest/shortest route, I followed the path of the 4 from Heworth roundabout.
I observed the following:
A 4 arriving into Heworth.

Between Heworth and Concord, there was one vehicle, loading/unloading in Concord on a Houghton bound service.
Between Concord and the Galleries, two Heworth bound 4's were following each other on Blue House Lane, just coming off the roundabout.

One in each direction were parked up at the Galleries.

No idea what the issues are/were.