Rare bird in British skies. Although this one is a fairly frequent sight around Barton Stacey. Not sure where it comes from. I'm guessing Boscombe Down, but it's only a guess.
Sorry for the quality of the picture it was a goodly way off.
The Army own / lease several of them, used in Brunei and Belize (I think Bristows or somebody provide the aircraft & maintenance as a package). They have one or two in the UK for pre-depyloment training of aircrew.