here's a couple of links to the two exhibitions I mentioned had been on at the arnolfini recently...
a video / documentation of the Say Parsley exhibition:
this one is for Imogen Stidworthy's "I Hate" installation:
Neither video is that good at conveying the installations and use of directional sound, etc... there's probably better ones online somewhere.
there's some more articles and so on about Imogen here: