Nigelh,
Have you ever taxied in 50m?
How about hover taxiing up a mountain in turbulence in v poor vis?
I've done both the former was in a £150m aircraft and needed a follow me truck on an airfield. Luckily I was part of a 3 pilot crew and it was difficult to go at more than 5kts.
The second event was with a v experienced 18,000hr colleague with a crewman hanging out of the door. We were only there because our pax had broken regs and quite likely would have perished if we hadnt got them.
Strong winds, high terrain, turbulence and as has just been mentioned potential icing ( and yes I've had rotor icing forcing a descent IMC) is an environment not suitable for
a 355 in anyone's hands. IMHO.