Drama: Silent Witness, BBC1, 9pm

This episode, which is split between tonight and next Monday evening, centres on the death of a teenage boy in a meth lab explosion. His inspirational headteacher Noah Taylor resolves to confront the drug dealers who are preying on his community. Dangerous batches of new drugs are hitting the streets and the effects are evident to Nikki, Jack, Clarissa and Thomas as they deal with the rise in both violent and accidental deaths linked to the narcotics, while tragedy strikes at the heart of the Taylor family. Emilia Fox stars as Dr Nikki Alexander while there are guest appearances this evening from James Bond actor Colin Salmon (left) and former EastEnders star Samantha Womack.