The two jurisdictions in the Channel Islands:[3] Like Guernsey, Jersey is not for domestic purposes part of the United Kingdom; rather, it is a dependency of the British Crown in the King's capacity as Duke of Normandy.
This is because Channel Islands were the only part of the Duchy of Normandy not to be conquered by France in the reign of King John.
However, the United Kingdom is responsible for Jersey at International level, and the United Kingdom parliament (in which the Channel Islands are not represented) has the power to legislate for Jersey - although by convention this power is not exercised save with the consent of the Island, and in most matters legislation in Jersey is left to the States of Jersey (the Island's parliament), subject to Court being approved by Her Majesty in Council.
[5] Competition Law (Jersey) 2005 prohibits certain mergers and acquisitions of companies and businesses taking place without the approval of the JCRA.
According to The Competition (Mergers and Acquisitions) (Jersey) Order 2010 prior approval from the Jersey Competition Regulatory Authority (JCRA) is necessary to acquire in cases were such merger or acquisition would result into a new undertaking with a share of 25% or more of the supply or purchase of goods or services in Jersey, or enhance such a share held by an undertaking[6]