Solutions
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FnkyMnky's post in Changing contacts pictures on Amundsen was marked as the answerI haven't been out in the car much since I posted this problem owing to some acute back pain but now that I'm on the mend I fiddled about with the unit and found that although the 5 contacts which show when I press "Phone" were the old pictures, the pictures in the Contacts list were the new ones. So I deleted the 5 "old" contacts then re-added them as new contacts and presto! new pics all round.
Funny how stupid, unimportant things like this can cause so much annoyance.