I went on a taster course organised by the University of London in Autumn 2007. My experience was that the emphasis was on occupational psychology as opposed to business but maybe that's just with the university of london.
The course wasn't to my taste but then sociology and psychology were never areas that particularly interested me.
If you are interested in psychology and don't mind specialising in the subject then a Business Psychology course is probably designed for you.
If you prefer areas of business like accounting or marketing then avoid these sorts of courses at all costs, because sitting through lectures will be really monotonous.