To find your disc you first need to know the colour of your original disc.
Red is for early X5 and 3 series
Purple for late series X5.
It is very difficult to find the latest discs for Australia.
These are the links that I know about
RED disc v14
PURPLE Professional disc v14 torrent
PURPLE Professional disc v14 direct links
Part 1 - Part 2 - Green Business disc v14
The links I had for the Green V14 are now dead.
I burn the discs to a CD with Imgburn at a low speed.
Do not burn to a DVD as the images are for a CD.
The megaload links are no longer active as at 29 October 2010
The PURPLE Professional disc v14 torrent is still active