Finally a message from Garmin re map updates, as follows:
"Dear Customer,
We're pleased to report that map updates are now available to be downloaded for your Honda vehicle. Garmin Express will offer the latest map version compatible with your specific vehicle.
Due to the size of the map updates your vehicle will either be offered the City Navigator Europe 2023 or City Navigator Europe 2024. This varies depending on your specific vehicle.
To begin the map update process you'll need a 16GB USB flash drive. We recommend formatting the USB flash drive prior to beginning the map update process. Instructions for formatting the USB flash drive and be found in our FAQ:
Formatting a USB Drive for a Honda Navigation System
Once formatted, full update instructions for your vehicle can be found at
http://www.garmin.com/honda.
Kind regards,
Loek
Garmin Automotive Helpdesk"
Unfortunately, I get offered City Navigator Europe 2023 on Garmin Express at a cost of £21 which I don't think is any improvement on what I've got loaded at the moment! Looks like the end of the road for map updates on my 2017 Jazz.