(10 Aug 2022, 11:28 pm)ALavery wrote Would it be more expensive to convert them to fully electric? It’s a possibility and that would do some good for allocating around the CAZ

Given the cost of batteries, and the amount they'd need to give them a somewhat decent range, I reckon they'd be lucky to get change from £100k per bus for the conversion.
The StreetDeck Electroliner comes with a 340kWh or 450kWh battery, which would be around £50k or £70k for the battery alone. Then you've got the cost of the motor which would probably be another £10K, all the electronics to control it, the modifications to the chassis to handle the weight etc.

Plus, the problem with converting them to electric would be finding somewhere to put the batteries given the chassis wasn't designed for it. 
Ideally they need to be spread evenly across the axles, and while the B5Hs do have the space at the front where the old batteries were (Lead acid I assume, so there's probably a fair bit of space), I doubt it would be enough to get any useable range out if it.