The series' first 2 parter.
From suspects to police officers: Claire Rushbrook (Rachel Baldwin), a suspect, would go on to play a Detective Inspector herself in No Offence (2015) the following year. Sunetra Sarker (Hema Patel), also a suspect, would go on to play a Detective Chief Inspector in Safe House (2015) the same year. She had also played a DI in Mobile (2007) 10 years earlier.