(03 Aug 2019, 3:50 pm)Adrian wrote
Unless its changed, they are valid on all routes except the 85 between Cockfield and Bishop Auckland, 111/112/113 between Ferryhill and Bishop Auckland. You'll need to have a pre-purchased ticket, as they cannot issue them.
Most drivers I've found are fine with them, but you get the odd one that will refuse it unless you argue the toss.
Interesting how you don't mention the Durham Park and Ride services. I believe Explorers aren't accepted on those either, at least that's what the driver told me when I asked.