Taylor Swift has been named the world's most successful act of 2014 by global music organisation IFPI.

The 25-year-old was the world's most popular recording artist across all music formats last year, with her fifth studio album 1989 topping the iTunes sales chart in more than 95 countries on its release. It has gone on to sell over 8.6 million copies worldwide to date and was the top selling album of 2014 in the US, where it has now spent 11 ...