Had the same issue, they are and absolute tw@t. Took me and my mate 2.5 hours, because of how tight the bolts were, and lack of access. As above you can buy a apline set from Halfords. We found the easiest way was to use the spline socket, (think it was size 14) use a fixed bar, from a socket set and use the wheel brace. Just make sure you get the car as high as possible, and that you use axel stands, and chock the front wheels. Because we had to use a lot of force. We then used copper grease to hopefully make it easier to remove next time.