Where a written agreement provides that supply will not start until some or all of the price is paid and the price is payable in two or more instalments (a deposit counts as an instalment), and the consumer has not been given a copy, declining to hand over a copy when the consumer asks is an unfair practice (paragraph 27). This targets prepaid packages and lay-by style arrangements.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.