ExAscoteer
I am not sure if you are deliberately misinterpreting my posts but I try to make things a little more clear.
At no time did I say that an aircraft would taxi without clearance from ATC, my example was for an aircraft approaching the hold at the active end of the runway who has been told to change from ground to tower.
The whole point of the "Taxing to hold short of xx" call is to assure the tower controler ( and any traffic on final approach ) that the aircraft in question has no intention of passing the hold that it has previously been cleared to by the ground controller with the minimum verbiage.
Perhaps you might explain what a puddle jumper is ? I normaly fly at airfields that have fixed wing and rotory traffic and have yet to encounter this type of machine.