Thank you for your reply. Unfortunately I had done all of this before and it makes no difference.
The iPhone Maps voice prompts used to come through the car radio speakers with no problem but suddenly stopped. The weird thing is that I can still listen to music/ audiobooks etc via iPhone - blue tooth connection to the car radio speakers.
I am not very technical but wondered if it might be anything to do with my iwatch which delivers haptics to my wrist when I am driving and using Maps?
I rely on Maps a lot so its really frustrating to have lost this connection somehow!
Any other ideas would be very welcome.
Mackirdy