On cancellation of a telemarketing contract (other than by cooling-off) or non-payment, the seller may not claim more than the statutory amounts (usage fee or loss in value, sale price if not returned, price of services provided, or ordinary costs before delivery) plus statutory-rate interest, whatever the contract says; the cap does not apply to instalment sales.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.