Literally signed up an account just now to respond this this old thread
You sir have saved me a massive bill even from 3 years in the past
Carried this out this morning, literally took 15minutes total and now have a fully working steering column lock.
Issue I had was key was turning ONCE after a battery disconnect then was unable to be turned again.
Using a diagnosis tool (launch) i was able to monitor the immobiliser status when inserting the key, seems the column lock being stuck open was triggering the immobiliser until battery disconnect.
Can now hear the column motor turning when key is inserted and all my key/barrel/immobiliser woes are over.
Thankyou so much