In my enthusiasm to ditch windows i thought i'd attempt to get my scanner working as it seems drivers are now available for the GL646 chip.
Ubuntu wiki have a 'how-to'
https://help.ubuntu.com/community/CompileSaneFromSource
https://help.ubuntu.com/community/CheckIfScannerIsClone
The first link appears to download more than necessary it seems.
I would be grateful if someone more knowledgeable on drivers could read those pages through as something isn't right somewhere. I was just going to buy another scanner but the latest Canoscan (and others) also use the GL646 chip.
thanks james