We've teamed up with MessyWeekend to offer one lucky reader and a friend the chance to WIN three pairs of sunglasses each, worth £500. Rather than just another eyewear brand, MessyWeekend is a lifestyle, movement and a promise. Offering cool urban eyewear that doesn't break the bank, its philosophy is that fashion should be an expression of individuality, and that affordability shouldn't mean compromising on quality or giving back. Sign up to SL Man and answer the question below to enter…