Thank you t-p for your response which is very much appreciated.
The suggestions didn’t specifically solve my problem but did lead me to look further for a solution.
Eventually I deactivated all plugins and reactivated only a few. Out of those few plugins I identified one that was blocking the upload of images. There maybe more but I will find that out at a later date.
Again I thank you t-p. This was my first time on the forum and although ‘a little scary’ it was rewarding to have received a response which lead to a result.