Probably best not to show this post to your MOT tester as few check for kingpin/bush wear correctly...
As Spanner Juggler correctly points out, the end bit of the kingpin will show the least wear. The part with the wear is the most used - ie where the slider normally sits.
To check movement, jack car up and support. Either apply brakes with a stick, or recruit someone to push the brake (kids usually love doing this). Then, holding the wheel at 5 past 7, lift (with your hands) and push/pull to feel wear. Repeat at 5 to 5 (it's time for Crackerjack...), then do the same to the other front wheel.
I make the point about the brakes as with them on, the play in the front wheel bearing disappears, and there should be some. None at all risks bearing seizure.
