The United Kingdom Standard Industrial Classification of Economic Activities (SIC) is used to classify business establishments and other standard units by the type of economic activity in which they are engaged. The new version of these codes (SIC 2007) was adopted by the UK as from 1st January 2008. With the agreement of the Office of National Statistics (ONS), Companies House uses a condensed version of the full list of codes available from ONS. Please be aware that only the codes made available on the condensed Companies House list can be used on the Annual Return. Codes used from other sources than the Companies House list may mean your document is rejected, and your filing delayed.