As Mr Meldrew would say 'I can't believe it!'
As the unsharp mask has failed to function, although, strangely, the other sharpening tolls are there, I have now deleted Elements and re-installed and, wonder of wonders, it's all there. A slider adjustment of 1 did the job.
Many thanks to both James and Craig - what would old duffers like me do without the kind advice given freely by the likes of yourselves.
Story end I think!
"Many Australians haven’t actually been there ……….."
Craig, Adelaide isn't exactly the outback. It's a beautiful if quiet city by Sydney standards with stacks of thinly populated beaches nearby.
Oh I know you were only kidding!
Thanks again both.