Figures show that the UK economy shrank by 6% at the height of the recession in 2008-09, lower than the previous estimate of 7.2%.
This is because the ONS's GDP calculations now include contributions to the economy from prostitution and sales of illegal drugs. In total, the new inclusions contributed £10bn to the UK in 2009 alone.
For the total period of 1997-2012, these changes have raised the level of GDP at current prices by an average of £50bn a year (4%), but revisions to the average annual rate of real GDP growth are small, leaving it only 0.1 percentage points higher at 2% .... http://www.managementtoday.co.uk