The Metro Kathy Burke is probably the UK’s most versatile actress; whether playing Linda in Gimme Gimme Gimme or portraying a victim of domestic violence in Nil By Mouth, the plaudits are all hers. Yet now she’s turned to her other love, and has her West End directorial debut with Betty, starring Geraldine McNulty at the Vaudeville Theatre. How crazy is it seeing yourself on screen?It’s horrible. People started to get really body-conscious when camcorders came along. They suddenly saw what they really looked like. You look in the mirror and see what you want to see but when you find out how other people see you, it’s a bit of a shock. Is…