The chocolate brand is adding two 100g bars, Fudge Chocolate Bar and Special Toffee Milk Chocolate – to tap into the £3.9bn chocolate market and take a bite out of the £584m block category, currently dominated by Cadbury and Mars' Galaxy brand.Thornton's claim that "extensive research" showed that the concept of a Thorntons block product was both "exciting and appealing to our shoppers" and that chocolate lovers would purchase the bar in addition to their current favourite products.