You have to undo the 4 x 7/16th nuts holding the steering rack in place, then move the rack away from the body, to get to the 1/2" nuts and bolts on the UJ at the bottom of the column.
I did that last weekend.
The hard part, and it can be very difficult, is stopping the very long bolts from moving round while you undo the 7/16" self locking nuts.
If the bolts do rotate, use a hacksaw blade, cut a slot in the exposed part of the bolt, put a small screwdriver into the slot to stop it rotating, and slowly undo the 7/16th nut. I had to do that on 2/4 nuts/bolts.
Alex in Norfolk.