Thieves don't need a key to steal a carSince the 1990s, most cars have had coded keys containing an electronic microchip which is paired with an engine immobiliser. It was meant to make it hard to steal a car without the key - but that didn't stop these thieves. How did they do it? The police officers who came to my home told me about something known as a "relay attack". It works like this. One thief stands close to the property, near an area where the car owner is likely to keep their keys - usually the kitchen or...