A firm that sits in a distribution chain must tell the FCA on becoming aware that a fellow chain firm is failing, or may be failing, to meet the Duty. This sits alongside the firm's own Principle 11 duty to tell the FCA anything it would reasonably expect notice of, including the firm's own Duty breaches.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.