When the former Russian spy Sergei Skripal and his daughter Yulia collapsed on a bench in Salisbury, it was Sunday shoppers who first stepped in to help. Amazingly, two of them were highly qualified medics. We hear their stories. Also, how the consultants at Salisbury District Hospital realised these were no ordinary patients. This episode was made by Marie Lennon, Andy Howard, Tom Ryan & Dan O’Brien. Executive production by Mary Sanders and Naomi Wordley.