They were one of music’s most iconic couples, the New York photographer and one-quarter of the most famous band in the world.  But in the world of Sex, drugs and rock and roll, the love of Paul McCartney and Linda Eastman was destined to be that rare thing, a romance that stood the test of time. And now, almost 14 years after Linda died from Cancer, her daughter Stella has launched a fragrant tribute to her parents love, L.I.L.Y, a beautiful eau de parfum that has launched exclusively at Selfridges this month. L.I.L.Y was Paul’s nickname for Linda, the letters standing for Linda, I love you. Lily of the Valley was also…