Done a little bit of tinkering on this today.
The sticky ignition key was getting a bit worse, and I was getting a bit concerned it might leave me stranded. After a bit of goofing, I found it yo be a common fault and could be "repaired" by removing the pin that activates the steering lock. Either that or about £100 on a replacement unit.
So, I did the right thing, and removed the pin.
Then it's key in and turned to p1, barrel out. Slacken bracket push retaining pin and the barrel is off. Obviously a couple of plugs to pull!
Someone has obviously been here before, as the surround to the pin wasa bit mashed and somone had scratched their initials on the barrel.
into the vice, little cover off, and spring and pin removed.
Assembly is reverse of removal.
All working nicely now.
Link to instruction video in case anyone is interested: