An actor of innate tenderness and grace, Warner had a theatre career of two halves, each with superb performances at the RSC I have never forgotten my first sighting of David Warner, who has died aged 80. As a teenager in Leamington Spa in the late 1950s, I used to haunt the bookshop in a local department store, Burgis and Colbourne, where serving behind the counter was a lanky, straw-haired guy in an ill-fitting Dic…