Right I have sused it. The airbag is held on by two spring clips on either side. What you have to do is push your screw driver in one of the two holes at the rear (back) of the steering wheel then open the spring clip by pushing toward the middle of the steering wheel. Do the same on the other side of the air bag. It should lift out. There is a star shaped screw in the middle to take off the steering wheel.
Ronnie, August 2007