Pepsi's UK distributor, Britvic Soft Drinks, is test launching the brand extension Pepsi Twist, in the UK from mid July.   Already a success in the US since its launch last year, Pepsi Twist is a lemon-flavoured variation on the Pepsi parent brand. It is targeted at Pepsi's core youth audience and will be available in 6 x 330ml multipack cans and 2lt bottles in grocery multiples.