The BiTurbo is the 180ps engined SE T5.1 California and a 2014 registered vehicle should be fine.
I say that because another member of the forum recently bought a 2014 registered van that had the classic oil consumption issue normally attributed to the 2010/11 model year vehicles.
The difference between Model Year(MY) or build date, and registration date can be significant. The van may have been built in 2011 (the problem year) but sat in a dealer's yard until registered in 2014.
The best way to check is to look at the label on the Exhaust Gas Regulator (EGR) at the bottom of the front of the engine behind the radiator. There should be a suffix on the part number on the label. This can be 'A', 'B' or 'D'. 'C' was never issued. Likely to be an 'A' if the van is a 2014 MY one. This indicates an updated EGR is installed.
Also, ask what the oil consumption figures are like. In theory, the engine having covered just 75k miles in 8 years shouldn't consume any oil between services, but a small amount is acceptable. If you have any doubts, walk away. High oil consumption issues are expensive to rectify costing in the region of £8k if the engine needs to be replaced.
Good luck.
Alan