(24 Jul 2014, 4:44 pm)NEBCD Malarkey wrote Was it not this - YJ12 NBX - Optare Solo SR Demonstrator
https://www.flickr.com/photos/nebp2/14754432923/
Note that it also has Passengers on Board, Wonder if GCT have took over the 73 a few Days Early.
Or drivers route training?
I'd imagine this will only be with GCT temporarily, and that it's a loan from Optare whilst new vehicles are being manufactured - given that it'll have a total capacity of 48 opposed to 49 (like new Solo SRs have).