American merchants like to complain about regulation, but they haven't seen anything like this. Yesterday the U.K. Competition Commission recommended the creation of a new regulator to police supermarkets and their relations with suppliers, concentration of stores, land monopolies and so forth. Perhaps one reason this is necessary is British land-use laws, which are more restrictive than American ones and hinder competitors from moving into the territory. From The Guardian:

A dedicated ombudsman with tough new powers to protect farmers and suppliers from exploitation by supermarkets has been proposed by the Competition Commission.

After a two-year inquiry into the £123bn grocery market, the watchdog wants an ombudsman to police contracts between grocers and their suppliers. The new body will have the power to "proactively investigate" breaches of a new code of practice which will govern how supermarkets do business with their suppliers.

Supermarkets may also have to appoint in-house compliance officers to ensure they comply with the code.