Which email program did you open it from? If you open it in outlook it has a habit of storing the attachments locally in a folder called somethink like OLKxxx e.g.
c:\Documents and Settings\<your user goes here>\Local Settings\Temporary Internet Files\OLK579
you can find out where that location is by opening another attachment in Outlook and doing save-as and you'll see where it was storing them. Then find that location in Word/Windows Explorer and hopefully your saved file will be there.
I WOULDN'T recommend opening the same attachment again via outlook as I suspect it may overwrite the previous version, I could be wrong on that tho.
Technotiger is correct - looking at your original question you say that when you had edited the document it asked whether you wished to save the changes and you said Yes. That means that the "original" document will now be the edited document.
Well.....the file name was JANE-CHILDCARE_1_1 then at uni i was experimenting and noticed the file name for it when i had saved changes was JANE-CHILDCARE_1_1_1 so i'm reckoning that its saved in this name but cannot find it anywhere.
Ive searched and everything and document does not open with updated or backed up documents