Cummins is a regular source of all kinds of vehicles undergoing testing, development or whatever, however most seem to be for the export market, being LHD.
However, I spotted this today, brand new and unregistered, (trade plates displayed 660HN) probably a test mule of some sorts, but with vinyl blinds installed, and centre doors (London Spec?) Obviously one of you awesome folks will tell me everything about it. Extremely sorry about the terrible pictures.