I always think the likes of GNE’s route 1 should have a ‘M’ symbol on their destination screens to indicate where in Gateshead it actually terminates. If there’s no room then maybe add ‘Int.’ for interchange.
‘Gateshead’ is rather vague.

Personally don't see the problem with Gateshead it would be more confusing with Int though. That stands for international imo and that's the name of the athletics stadium.

I don't really see the point in it going over there anyway, we're supposed to be removing polluting vehicles and there's more than enough services for people from Byker to change to, terminating at the central station in Newcastle would be a better location imo and would offer argubly more connections since pretty much everything that leaves from Gateshead passes Central, Market Street or Newgate Street anyway.