Next time your car breaks down or won't start, and the AA says there's a two-hour wait, here's a tip. Tell them you're a doctor or a nurse or a teacher. Say you're a plumber on an emergency call - and you'll get priority. "It's a good trick", says Sgt Johnny Towers , who is based at Stanmore, Britain's busiest AA Centre. "That way they get instant service." Today a doctor is locked out of his car. They rush to his rescue. He is a doctor. "Any patients waiting?", he's asked. "Well, no ... I'm a doctor of science." Nice one. A nun with a flat battery calls in - and a woman with two children has to be towed away. On the M4 a member who "breaks down all the time" waits patiently for help, along with hundreds of other casualties who haven't thought to tell a lie.