I think it was only broken recently - can't remember the name of the guy who did it - young bloke, blonde straggly hair.
As for Beamonn - I suspect altitude played a part but from what I've heard he wasn't an outstanding jumper at the time, if it was just the altitude then you'd expect others to jump as far.
I have a feeling that Cathy Cook's sprint records still stand, but I couldn't swear to that.