These instructions were shared with me by Larns
"The self cancelling in one direction is often because whoever refitted the steering wheel last did not centralise the self cancel switch.
Pull the wheel off and you'll see the blue ring that the striker on the steering wheel locates into.
Push the indicator stalk into one of the directions(dosn't matter which one).
Now turn the blue ring in that direction untill you feel it "click" the indicator stalk.
Now if you turn it back the other direction the stalk should cancel.
Try this the other direction, if it dosn't cancel within the same amount of movement then the ring reeds to be turned 180.
When you have an equal amount of movement before they self cancel, ensure the notches in the blue ring are vertical an carefully refit the steering wheel so that the striker fingers slot into the ring.
If none of this workes then your indicator stalk is ratted an you need a rew one.
Hope this helps, I've done this to dozens of 110's that wouldn't self cancel to fix the problem"
Full post here: Australian LandRover Owners Forum