I have finally settled on using Primo2 (after trying igo8 and primo 2 international)
I am using Serena (TTS v5) v172646
The only problem i have is this.
When i am going above the speed limit i get "the speed limit is xxx kilometer per hour slow down)now i like this warning apart from the "slow down" bit is there any way i could delete this part of the sentence and if so where could i find the file that contains it.
I was playing about with the voice today and found the part that says "hello i am serena drive carefully today"i manage to delete the " drive carefully today" bit
Cant find any other words in that file.

It's in the dictionary.voice file within the {voice}.zip file, Drag this file out of the WinRAR window and edit in Notepad, Save and drag and drop the file back into the WinRAR window and click yes when asked to overwrite.

You may need to select another voice then go back to serena to hear the changes...

Stop!="Stop!"
The speed limit is %s!="Slow down to %s!."
tmc_supported="tmc_supported"

Thank you Fatboyfun,i have managed all that and will try it out on the road tomorrow.

All tested and working like a dream.thank you.

Thanks for the update :)