I removed my driveshafts using a special key tool bought from halfords... the head kinda looks like a star...
Ask one of the guys at halfords, they should know. They come in a set of about eight different sizes and fit on your wrench tool.
It wasnt easy removing the driveshafts on mine.... partly because there is a rubber joint to the gear which makes it hard positioning the tool right... and also the crap that surrounds....
I carefully used a hammer to push the tool into the driveshaft bolts.......... be careful if you do this.
