This time, Jeremy investigates what the authorities are doing to clamp down on the growing trend of acid attacks in London. He follows Met Police officers as they show him how they deal with an acid attack, and what they are doing to try to limit the availability of the ingredients that gangs are using to perpetrate their crimes. The programme hears from the victim of an unprovoked random attack about the impact on her life - not just from the physical disfigurement but from mental scars which meant she was left fearing leaving her home. And Jeremy confronts an ex-gang member who admits he has thrown acid on someone before.