Photos - You don't need to remove the steering wheel and the indicator / wiper stalks, but it made it easier, less risk of damage and meant that a photo was possible !
You do need to remove the steering column plastic cover - carefully peel off the rubber ring around the ignition key switch first to avoid damaging the immobiliser coil (which can be removed later).
Then it looks like this. Shear bolts at top of photo - unscrewed with careful application of a shard small cold chisel and a hammer - you only need to loosen one and undo the other if you have the column stripped as shown as it then slides off once the steering lock dog has dropped out of the column.
Applied thus !
Once loosened turn with pliers or old wire cutters - then drop the ignition key assembly to free the steering lock and withdraw. If you haven't taken the rest of the bits off take both bolts right out.
Once on the bench carefully (lift plastic tags) remove the immobiliser coil and the light up perspex ring.
Then you have this on one side.............
and this on the other.
Now, I haven't got an Xray machine, but I'm thinking that the steel pin and the roll pin don't go right through or the barrel wouldn't turn. I have tapped the roll pin on one side and it doesn't move on the other, I imagine that drilling both out would free the barrel but would it go back together again? When I have the broken lock to play with I will drill them out, see if it was necessary, see if it gets the barrel free and then tap the holes and try to replace with short grub screws. More of this soon.