This Black Friday event is going to be replicated later in December and January, and much newer products available in the Christmas Sales and January Sales, and the products they are selling cheaper on Black Friday are usually older or obsolete/discontinued stock.
Given a choice of queueing in the freezing cold for hours on end, and when you do get grappling and fighting like some neanderthal just to save £30,£50,£100 or so on a discontinued and older specification item......and my nice warm bed with my nice warm wife, guess what I'll pick. :-)
I'd wait for the Christmas Sales or shop around as plenty of bargains out there online and in-store and many shops will price match or better on items, if you just ask them. Happy Shopping. If you pick up a bargain and feel pleased with it, then good for you. :-)