What a bloody nightmare!!
Things were going well, working through somones tutorial until I must have got side tracked (strangely this happens often) and ended up trying a different way to do it.
At one point I had my drive visible on the RPi but could only read from it, not write to it.
I spent ages going round and round, installing this and that, but eventually I came across
and although not a goflex drive, seemed to work a treat, although I have my suspicions on whether the drive will still be connected after reboot.