In most cases, the C+ entitlement only applies when travelling within the area of the local authority who issued the pass.

If you head into Teesside for example, you can get a companion ticket on the journey there (as you board in County Durham) but the driver won't be able to issue one in Middlesbrough to come back, so Companion would need to pay to return.

Pass holder is always free, anywhere in England after 0930.