(23 Dec 2022, 4:37 pm)F114TML wrote Why did it need to go round Easington? Couldn't it have gone to Moorsley and then done the same route as the 65 (missing out Buckinghamshire Road) to Belmont and pick up the route from there?Most journeys did just that, just the one example given that didn't for whatever reason.
This is how most diverted...
Durham bound: https://bustimes.org/services/20a-sunder.../356162945
Sunderland bound: https://bustimes.org/services/20-durham-.../356166319
Carville was served Sunderland bound however was omitted when heading towards Durham on the journeys I could find at least (via Pittington Lane, Pittington Road, High Street then Pittington Lane again towards Moorsley).