(13 Aug 2013, 5:31 pm)gtomlinson wrote I'm going to ask Nexus
As Nexus-branded vehicles are owned by bus companies there is nothing to stop them being used on other services according to their operational needs. We expect to see branded buses on the routes we pay for using public funds unless there are operational problems
source:
http://www.nexus.org.uk/nexusbus-arriva