the market'. This is when they have to find out which products are in which industries so they know what percentage to do. If the CC concluded that this was the case, it was required to seek to remedy the problems that it identified either by introducing remedies itself or by recommending action by others. Reviews of undertakings or orders Undertakings or orders are the primary means by which remedies were given effect under the Enterprise Act 2002 and the Fair Trading Act 1973. The OFT had the statutory duty to keep these undertakings or orders under review and if it considered that due to a change of circumstances a set of undertakings or an order should be varied or terminated, then the OFT referred it for consideration by the CC. Responsibility for deciding on variation or termination of undertakings lay with the CC. Regulatory references In relation to regulatory references, the CC's role was dictated by the relevant sector-specific legislation. Companies regulated under the gas, electricity, water and sewerage, postal services, railways or airports legislation generally had a formal instrument (a licence) setting out the terms of their operation. If a regulated company did not agree to a modification of its licence proposed by the regulator, the regulator was required to refer the question to the CC. The CC then considered whether any matter referred to in the reference could be expected to operate against the public interest and, if so, whether it could be remedied by modifications to the licence. These references could involve the price control applied to the company. The CC also had roles under the Financial Services and Markets Act 2000 and the Legal Services Act 2007. Energy code modifications and Communications Act appeals The CC had an appeal function following decisions by the Gas and Electricity Markets Authority to modify certain energy codes under the Energy Act 2004 and in relation to price control decisions by Ofcom, following a reference by the Competition Appeal Tribunal (CAT) under the Communications Act 2003. See also Competition law Competition regulator Department for Business, Innovation and Skills History of competition law References External links bis.gov.uk Competition Commission market investigation – Payment protection insurance (PPI) Competition Commission market investigation – the supply of airport services in the UK by BAA internationalcompetitionnetwork.org Corporate governance in the United Kingdom Consumer organisations in the United Kingdom Competition regulators Defunct non-departmental public bodies