Section 5 of the European Communities (Amendment) Act 1993

The important point here is that the United Kingdom is not obliged to converge with other EU member states. If I remember correctly, the terminology dates back to the Maastricht treaty, and this is a part of the process that originates from that. The UK is not subject to any sanctions as a consequence of our participation in this process, nor are we required to take any directions from the European Commission in respect of our economic policies.