 Many companies still use the 2003 codes which were the 1992 system updated slightly.However, the very latest version is the 2007 SIC system

A Standard Industrial Classification (SIC) was first introduced into the United Kingdom in 1948 for use in classifying business establishments and other statistical units by the type of economic activity in which they are engaged.The classification provides a framework for the collection, tabulation, presentation and analysis of data and its use promotes uniformity.