I can hear a change when I begin to speak - impatience (some people think I am drunk) or gentle patronage (a response to an assumption that I have learning disabilities). I have, however, identified one benefit - in relation to telephone sales people. A man from the Daily Mail rang the other night. He could not wait for me to explain to him that I was the householder, said peremptorily that he would ring someone else, and put the phone down on me. Bravo!