The following Models with the N12 & N16 engines require 2 sensors:
2007-2013 R56 MINI Cooper Hatchback
2008-2014 R55 MINI Cooper Clubman
2009-2014 R57 MINI Cooper Convertible

The following Models with the N18 engine require 2 sensors:
2011-2013 R56 MINI Cooper S Hatchback
2011-2014 R55 MINI Cooper S Clubman
2011-2014 R57 MINI Cooper S Convertible

The following Models with the N14 engine requires 1 sensor:
2007-2010 R56 MINI Cooper S Hatchback
2008-2010 R55 MINI Cooper S Clubman
2009-2010 R57 MINI Cooper S Convertibles.

Both the Cooper and Cooper S uses the same Camshaft Position Sensor. Sold each.