Thank you for the help (and Dave also). I believe it is the shutter speed and have just now packaged it up, with the storage card so they can see what was happening, and sent it up to the Service Centre.
As before, I guess this is a wait, hope and see situation and I guess that gives me more time to consider just which photography course to decide on :-O
Really appreciate your help guys and thanks again.
Cheers Deb (In wildness, nature is not human hearted!)