Photos in Telegraph seem to show the blades still intact and atop the rotormast (rest of helicopter behind hedge but appears to be from head on and leaning to one side) so hopefully a survivable heavy landing.
Pics show this one does have pop out floats, how are they triggered?
Edit: from.BBC:
One patient has been treated and airlifted to the major trauma centre at University Hospital Southampton, the Hampshire and Isle of Wight Air Ambulance say in a statement.