Thanks to all of you who have posted now and in the past I went ahead and followed the instructions to modify the voice files for the NAV system. I switched the USA to the GB voice and man is she must nicer to listen to. Why they picked the annoying sounding american voice is beyond me, no longer do I have to listen to "If possible make a legal u-turn" now I hear "If possible make a u-turn" and it sounds right and polite.
I like the "take the second turning on the left"
Feel free to write me if any of you all have more questions on this process or how it sounds. (she speaks slightly slower and the words are better put together I think)