Whatever did we do before ghd’s? It’s hard to believe there was ever a day when we didn’t have the Aston Martin of stylers, but once upon a time we left the house with some pretty strange, not to say rather frizzy, hairdo’s. But this month sees the 10th birthday of the nation’s favourite straighteners/stylers, and to celebrate, Selfridges are running a special, month-long promotion for fans of ultra sleek and stylish hair and the product that won Best Life-Changing Product in the Fabulous 2011 Beauty Awards. Until the 31st July, you can save £20 on the Iconic Eras of Style range, featuring the new ghd Gold Classic Styler. This…