A reboot did not change anything, and there was no indication that the keyboard should be set. I went back to settings>gemini settings>Select your Gemini keyboard layout. At first the select option did not seem to work, i.e. no selection was indicated as being made (no dot in the circle), and the display immediately returned to the previous display (Gemini settings) keying again the keyboard settings, the display was as before, nothing selected. However trying a few more language options, I noted on returning to the select keyboard display that the 'cancel' option was in the new language, and not English. Re selecting English, and confirming by the 'cancel' option, on returning to the home screen, all keys now select (or rather the ones I tried did) the correct keyboard. So problem solved, but I'm still unsure why, when all the steps were the ones I tried before