Ok, so I went with Windows as I was being impatient and it didn't quite go to plan, but somehow I managed to muddle my way through by hand.

The "sd filesystem" didn't exist, but I was able to disable signature checking and install the su app from the filesystem.

I verified that it was rooted by running an app that required root access.

So, I appear to be rooted now, do I need to somehow re-enable signature checking?

Adrian