Testing the Newham corrosive 'sales ban'
In response to almost 300 violent offences involving corrosive fluids between 2015 and 2017, Newham Council introduced a voluntary scheme for local shops to agree to stop selling corrosive substances to people under 21.
BBC 5 live Investigates followed an undercover investigation by Newham Trading Standards to see whether shops were abiding by the plan.
This clip is taken from 5 live Investigates on Sunday 25 February.
Video Journalist: Matthew Sydney