The CAA originally required a starting and stopping wind limit, and it was set at 26 kt, for no obvious reason as the Robinson rotor system is more resistant than most to blade sailing at low RPM, has large boom clearance and stiff blades. Usual precautions on gusty days, shut down with the wind from 2 o' clock so that the blades are rising as they cross the tailboom.
The Robinson homilies about flying in gusty winds relate to the possibility of attitude upset and mast bumping in the event of incorrect recovery action.
In reality, students don't get much use out of their flying due to the turbulence anyway when the wind is gusting up towards 30 kt.