Rules keep hospitality, promotional and other business expenditure bona fide, reasonable and proportionate, recognising that lavish or unconnected expenditure (for example unrelated leisure travel for an official) raises the inference of an intent to influence, and govern charitable and political donations; sector norms do not excuse extravagance (MoJ guidance paras 26 to 32 and Principle 1.6 and 1.7).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.