Translated means, you ain’t even rated enough to be allowed to broom round so they make the liability stay in the van !
I used to do similar with lads, you assign them according to ability….so the switched on lads would have switched on roles, the mongaloids could just about manage standing by a lift and pushing a button…..think about this, you ain’t even pushing a button !….you get told to wait in the motor ! lol
I can imagine the morning conversations with the Forman:
“Here Charlie, what shall we get the gonk doing ?”
”f***ing hell, leave that f***ing dreamer in the van,