I thought this might be better placed in here. I've just thought about the potential GNE issues if the 306/307/308/309 all went EV.

But, if NECA / TT2 permitted GNE's vans travel through the Tyne Tunnel for free including any dead-runs (I think these are already covered), could Riverside not take the 307 & 309 on using Haymarket (Arriva office) as the bait room and in return, Percy Main take on the 27 with driver reliefs in Jarrow?

There's only a PVR difference of x3 between the services  (11 vs 14).

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The only issue I could foresee is if there's an incident affecting the Tyne Tunnel - but GNE could even send drivers over via the Shields Ferry and somewhat regulate with reliefs in South Shields if worst comes to the worst.