8 units per session is certainly higher than the average figure that is bandied around. That's quite a number of pints of session ale, I would imagine.
Not having any better information to go on, I adopted the 2/3 unit a day concept and just shrugged my shoulders when it occurred to me that I was binge drinking just about every time I went to the pub because I invariably have 2 pints minimum on a night out.