Throughout the years, Primark has played host to some of the most popular collaborations.From Disney to Drag Race and Harry Potter, the high-street fashion retailer is always on the ball when it comes to official merchandise.But Primark's latest announcement could be one of its most important to date, as it has confirmed that it will be collaborating with Soccer Aid for Unicef - the world’s biggest celebrity football match, which raises money to give children the best start in life.As a