Found more Durham County proposals online, this time is for the 22/23 in Peterlee:
22 - hourly Durham to Sunderland with all trips via Easington Colliery, one journey an hour renumbered 22B running via Acre Rigg in Peterlee running Durham to Peterlee only. Late evening buses proposed withdrawal.
23 - half hourly Hartlepool - Peterlee, hourly Hartlepool - Sunderland. Some journeys to become 'college days only' to enable buses to operate 'East Durham College' contracts.
X22 - no longer serving Acre Rigg in Peterlee (no other publicly info avaliable on the X21/X22 as yet which I've seen at least).
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Arriva North East: Upcoming Service Changes