Had Nick never heard Bert Jansch, John Martyn, Donovan etc, he would have sounded like a totally different singer! Put another way, had Nick been born ten years earlier, and first recorded in the mid-fifties, again, he would have sounded totally different than the Nick we know. Why? Because he contrived a "voice" based on his musical influences - which, obviously, includes the way he pronounces words. And, to my ears, the voice he contrived sounds self-conscious and false.