Looks like we cracked it using the following method:
Booted into a QNX OS (http://www.qnx.com/products/neutrino-rtos/neutrino-rtos.html) via a live boot CD.
Restored the original image from the Audi sat-nav onto another HDD and connected to the QNX OS.
Mounted the drive in the OS. Initially the OS couldn't read it as the sat-nav system used a QNX6 file system but the OS default is QNX4. A bit of Googling for the right terminal commands got round this.
Mounted a FAT32 formatted USB stick into the OS and carried out a logical copy of the file system from the sat-nav drive onto the stick.
The downside to this method is that the date/time stamps on the original filesystem are not preserved but it does mean we can at least view the data and assess the value. We've found many db files that appear to contain sat-nav data which we can present.
Extracting the file system to maintain metadata is another challenge......
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