Let this post be a lesson to any one who stores electronic files of their work.
I tried to access copies of my illustrations only to find out they were no longer there, I reassured myself that all was not lost as they were backed up. However the only things I could recover from my back up were corrupt scrambled images that were no good to anyone.
I have closed the shop while I try to sort this out. I have no idea how it happened but I think we have to assume that previous work is written off. However I am trying to see the bright side - this is a chance to create all new work, a new beginning.
Damn you technology, but you can't keep a good illustrator down!