I don't know, but a quick google suggests that that aircraft belongs to a company with a fleet of DA42s used for a mixture of slightlyV-IP transport, and surveying work. They also have a contract with MoD to provide low cost ISTARs support to military training exercises (
http://www.dosystems.com/training/aerial-istar).
In Afghanistan, my money would be on it being used for surveying work of some description, as I can't see that being the right asset for ISTAR work in the particular theatre, and VIPs over there tend to be flying in something rather more robust!
G