First of thankyou for replying to my query.
In reply to your question Robert I backed up v7 and then tried to restore in v8. As an extra I also backed up onto a stick and neither can I make work.
V7 still exists and no I don't have both open at the same time. To answer your last question not to my knowledge. I seems strange that I have been able to restore 2 of my projects but not my third one. It has restored a previous back up of my thrid project but not the latest one that I did for the transfer to v8.