On the 18th of March a new version of Raspian was on offer, so I downloaded it and took all my micro SD cards and put it on them....
That completely fixed the problem !
First I did:-
sudo apt-get update
sudo apt-get upgrade
with that I maxed available space also enabled the camera.
and lo everything worked including the camera !
raspistill -v -o test.jpg
got a photo stored in the home directory !
I'll go round my other Pi's and see how they cope with the 18th March version of Raspian !I did find two knacked micro SD cards and that caused 99% of the problems ! (I think)
Thanks to all who offered support !!!