As I reported earlier Primo MX06AEA was on Aycliffe 17's.
https://www.flickr.com/photos/127079988@...240665690/

Ex JSB Solo V470GBF was on the ASDA Free Bus
https://www.flickr.com/photos/127079988@...402383806/

V499EWV was on the Tesco Free Bus.
https://www.flickr.com/photos/127079988@...428426555/

To me it makes more sense to use the Primo on the 17 as it is newer than the Solo and looks better too, it may mean they are more likely to keep the contract for the 17 where as the Solo may make DCC think otherwise, although when I took this photo it was running around 10 minutes late.