TWK was a British alcopop

Alcopop

Alcopop is a colloquial term describing certain flavored alcoholic beverages, including:#malt beverages to which various fruit juices or other flavorings have been added...

, available at Tesco

Tesco

Tesco plc is a global grocery and general merchandise retailer headquartered in Cheshunt, United Kingdom. It is the third-largest retailer in the world measured by revenues and the second-largest measured by profits...

 stores. Its name was recently changed to TVX and its label rotated, presumably to eliminate the similarity to the more widely-known WKD

WKD Original Vodka

WKD Original Vodka is a brand of alcopop produced by Beverage Brands. It is sold and heavily marketed in the United Kingdom with the slogan ‘Have you got a WKD side?’ , and also in many countries in mainland Europe. AC Nielsen ranked it as the number-one UK ready-to-drink brand in 2006.-Product...

.

It is sold in five brightly-coloured varieties: Apple, cherry, orange, lemon and blue. Each variety is 4% alcohol by volume. It is sold in 70cl bottles, in which cherry, lemon, blue and apple are available, and multipacks of eight 275ml bottles, which generally include three lemon flavour, three blue and two cherry