This VOSA registration (from last Friday!) might given an answer as to why they have purchased the Solo.

2PB1042348/38 - PREMIER BUS & COACH LTD, R S L BUILDINGS, CONISTON RD, KITTY BREWSTER INDUSTRIAL EST, BLYTH, NE24 4RN
Registration Accepted
Starting Point: BEACON HILL CRAMLINGTON
Finish Point: EAST CRAMLINGTON NEW HOSPITAL BUS STOP
Via:
Service Number: CRAMLINK ROUTE 10
Service Type: Normal Stopping/Hail & Ride
Effective Date: 29-JUL-2013
Other Details: MONDAY TO SATURDAY 1 HOURLY SERVICE SERVICE DOES NOT OPERATE SUNDAYS AND BANK HOLIDAYS