A teen schoolgirl goes undercover to expose shops selling illegal vapes to children, while a head teacher claims pupils can't get through a lesson without vaping. In another case, shocking bodycam footage reveals a young family living in rat-infested conditions.

Shocking river pollution – but is Britain's biggest water company to blame? The Defenders investigate as thousands of dead fish are discovered in contaminated ‘dead rivers'. And they seize thousands of dangerous phone chargers with fake safety certificates.