The only routes I know of due an upgrade (taking into account what's said on here are)
X66 and 58 - 11 Electric single deck by 2026 (Zebra round 2 funding)
21 - No idea on number but Electric double deck (Zebra 1 funding - I think)
56 - New ADLs
RE: Go North East - State of the Fleet
Wistfully stuck in the 90s