As Jacko says, reports on these have been turning up on the spotter sites for a few weeks - along with the 4 new Dauphins and the DA42 Twin Stars that have appeared on the military register in recent weeks.
The arrival of one Mil at Boscombe was reported this week.
And one of the aviation rags was reporting (with photos) on UK operation of Hips a year ago (and the nature of those operations)