Update on this...
I've had a quick look at all of my monitors under low ambient lighting (on factory settings, as I don't have my calibrator with me atm) and they all seem to show some form of blacklight bleed in the bottom left corner (a yellowish tinge), however one of them seems to be quite a bit worse than the others (unfortunately that's the one I randomly chose to be the centre atm)
I'm going to have a proper look at them tomorrow (and maybe get some pics up of it) and try and decide if I'm going to get this one swapped out (which I probably will)
Has anyone swapped them out already? what was the replacements like? Was it better? Are they refurbs, or new units?