Dear *****, Thankyou for your help the other day.
By doing double and even triple checks with other cameras and mine we were able to prove to ourselves that the problem was 'other'. We discovered that the card in question is a Samsung adaptor for a micro SD card. And that the micro SD card is missing from it. We are now searching all nooks and crannies in the house for the tiny card, it must be lurking somewhere, nothing odd or questionable is ever discarded in this establishment!
Sorry to have raised a red herring for you.
At Christmas I ran through the contents of the Samsung adaptor on my camera, so the micro SD card must have been in the adaptor then, I removed the card, stored it in the original plastic bag it arrived in, and put it safely away.
I was not aware that Amazon had supplied on purchase of the camera and parts a Samsung adaptor and micro SD, there was no note of explanation that the card was not whole bodied.
One lives and learns, at least we know when we find it that three years of photos will still be there. Thankyou again Vanessa