The Secret Gardeners – Britain’s Creatives Reveal Their Private Sanctuaries by Victoria Summerley with photographs by Hugo Rittson Thomas (Francis Lincoln $45) is a glamorous armchair tour of beautiful gardens created such creative people as Sir Richard Branson, Julian Fellowes, Andrew Lloyd Webber, Rupert Everett, Sting and 20 other familiar and not so familiar British stars. Most of us don’t think we are engaged in garden design when we go out to plant a perennial bed or plant…