Well, following Ordav's comment I gave it another go. It worked. I cleared all Bluetooth references between the phone and car and started afresh. Different messages came up (that I hadn't seen before), including connecting to a Google app which I ignored because they want to know everything about everything in your life. After perhaps twenty minutes it was all done - only part of my contacts list to start - but then the full list after toggling between 'SIM' and 'Phone' on the car's set up screen. Thank you to everyone who showed an interest.
2015 2.2 CDTi SENav 163ps manual 4x4 in Carbon Flash with 19\" alloy spare towing a Bailey Unicorn III Madrid @ 1500kg.