Thanks guys I think they are a wise investment as well as being cosmetic.
I have indeed got a telephone mount and the cradle for a Nokia, but despite making lots of enquiries had no joy whatsoever finding an I phone 5 cradle. Very frustrating, so now I just use my Jabra cruiser 2 Bluetooth device which streams music and calls through the radio, works absolutely fine, and charge it through a USB adaptor in the cigarette socket.
Unless you are going to make my day and tell me it can be done, I've given up on the telephone stem.