Interventions to improve participation in bowel cancer screening: the value of lay advocacy and positive framing of risk.

Intervention 1: the use of a bowel cancer screening invitation letter to that contains photographs of 2 previous screenees who were diagnosed with early bowel cancer through their participation in a bowel cancer screening program, and with simple program advocacy statements from them.
Intervention 2: the use of a bowel cancer screening invitation letter that contains enhanced positive framing and generalised risk messages.
Primary outcome(s): Completion of faecal immunochemical test within 12 weeks of offer[]
Study Design: Purpose: Prevention; Allocation: Randomised controlled trial; Masking: Blinded (masking used);Assignment: Parallel;Type of endpoint: Efficacy