(11 May 2016, 4:39 am)Dan wrote Given that the staff shuttle van was parked next to 5422 on this photo, I'm going to suggest that it was on driver familiarisation.
This bus has been doing tours of the City Centre ever since it arrived at Deptford - drivers need to actually drive the bus, given that it's slightly different to the normal Streetlites. That's partly why the launch has been delayed.
The Micro-Hybrid technology does make them quite strange to drive. Sometimes when you take your foot off the accelerator it continues to maintain the speed until you tap the brakes, rather than a conventional bus which would drop in speed instantly. I only noticed it doing that on 1/2 of the original batch when they first arrived at Arriva so I'm not sure if it's different with the new batches.