Hi Lorna
Thank's for that, I feel a bit better about it now!
In your case was there any employment in Australia and where there any requests from DIAC to provide documents to backup the information given in Form 80? I would have thought that best estimates would be ok but I didn't want to risk not getting a visa because of it. I guess if we can't get the information then DIAC probably wouldn't be able to get any more detailed records that we have ourselves don't but that's an assumption, I have no idea what resources they have, especially when the employment is in Australia!