I agree with sabenaboy (not because I am a former sabena boy myself - but for his viewpoint) ; "position and hold" and "hold position" are too close to eachother.
On the other hand "line up and wait" doesn't seem to be the best alternative, as (with some background noise and poor english) this might be understood as "line up 1 8" while this is not the intended runway... I was told this happened in real and it would be the reason why we use "line up and hold" or "behind the landing aircraft line up and hold behind".