Kathy Burke had it all as an actress – critical acclaim, a top award at Cannes, and a place in the nation’s heart as Waynetta Slob. But now she has found a new passion, she tells Jasper Rees The Daily Telegraph Kathy Burke was, for a period in the 1990s, a sort of cockney working-class Judi Dench. Straddling the broad comedy of the television sketch show Harry Enfield and Chums and the unflinching realism of Gary Oldman’s movie Nil By Mouth, for which she won a best actress award at Cannes in 1997, she was one of those much loved performers everyone got used to always being around. When an…