However many thanks to @theunknowntech 's initial post ... (slightly out-of-date re-mobile phone apps) which lead me to the https://shop.glowmarkt.com/products/...eter-customers web-page, at the bottom of which are links to the Android/Apple "Bright" app
I've luckily got a SMETS2 meter (Landis+Gyr E470) and IHD - no need to buy any additional hardware just download the app; provide them with the GUID code (global unique identifier) from the IHD or from the SmartMeter display itself (Google for the button presses required)
This then allows the app to link to your unique smart meter, then bingo you've got all the usage data you cold possibly hope for on your phone - even download the data in CSV format to a spreadsheet etc.
Last edited by geoffers; 31-07-23 at 22:17.