Thanks for the prod rtj.
I had read many postings on the matter and tried various feasible-sounding suggestions - all to no avail. I just tried switching the Mac off completely, then re-starting after 5 minutes. I opened up 'My Drive Connect' before opening anything else, and plugged in the Start 25. The Mac recognised the satnav and downloaded the updates successfully; so now, I won't have to resort to the contingency plan of using my DiL's Macbook/MDC which still has El Capitan as its OS.
The Start 25 came with 'Free map updates for life' and, by chance, I had downloaded the latest map update before Sierra was installed. The 3 updates that were waiting were for map-share, a GPS fix and speed cameras.
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Tomtom/MyDriveConnect/MacSierra/Grrrr! 