Before & during Covid, Lothian had enough of a surplus fleet which allowed them to have vehicles rotated for maintenance. In this current state, if they had midibuses in the fleet, theres no guarantee they wouldn't be drafted in to cover larger vehicles when required. For some time, at least since the Solo's, Lothian hasn't had any smaller service buses. Generally, you'd only buy smaller vehicles if you had the services for them - you don't want to be using a midibus for double deck routes for example.
Which is why it was questionable at the time why they bought the StreetAirs, particularly for service 1. But at that time, the electric vehicle movement was in its early stages and it was seen as a slow transition and long term trial.
Sending the StreetAirs back to Wright Bus was agreed as part of the GB Kite and future Electroliner orders. The hope is that they could have a full cosmetic rebuild to improve build quality. I believe it was also discussed to swap motors and batteries for the new generations, which we see in the GB Kites. I'm not 100% sure at this point what has been agreed on this front. Regardless, they will need new batteries as they've been sat for so long.
The thinking behind these processes is that as a company, they'd be able to tender for smaller demand routes and should this fail, they could be used on rural routes in East Lothian.
Ideal for the 13, 32, 60. So there are current use cases.