As Salisbury starts to reopen in the summer of 2018, the authorities weigh up how to keep the public safe, when they know there could be more Novichok out there. Questions are asked about whether enough was done to protect people from accidentally picking up a discarded chemical weapon.

This episode was made by Marie Lennon, Andy Howard, Tom Ryan & Dan O’Brien.

Executive production by Mary Sanders and Naomi Wordley.