You cannot fix an electrical issue with wd40.
Had this issues a year ago on my vehicle and the unit failed in the locked position , anyhow it doesn't matter whether it fails in locked or unlocked because when it does truly fail you can't start the car which is what happen in my case. The wire that signals to the ECU to start the car gets its power from that unit.. according to schematics.
I fixed it by removing the unit entirely and locating one in a junk yard that was intact but in a totaled l322 , it took me an hour to remove the junkyard unit , paid $200 for it then installed it in my car , calibrated (rsw program) it and it works to this day. This how you fix the problem. Landrover will try to sell you and entire steering column plus programming costing you over $3k