This episode reveals the murky history of the Buy One, Get One Free deal that's been a favourite of the supermarkets for years.
The sales team in the rigged fashion boutique flog jumpers with a small percentage of cashmere as the 100% real deal.
And Jazzy Jim takes over a stall at London's famous Portobello Road market and tries to pass off economy jam and marmalade as gourmet products.
