Last week, grocery shoppers shared their outrage online as many discovered a 1kg tub of Lurpak was retailing for £9.35 in Iceland. Prices for the salted spreadable butter have raised eyebrows in other supermarkets, with 750g packs often selling at £7.25. Here, Which? looks at why Lurpak prices are rising, and ways you can save when buying butter. Why is Lurpak so expensive? Though pictures of the...