External verification of our CO2 reporting

Right from the start of our Greenhouse Neutral Programme in 2003, we have disclosed our CO2 emissions, their principal sources and relative performance over time. The method we use to calculate our emissions is based on the guidelines of the Greenhouse Gas Protocol, the most widely-used emissions accounting standard (www.ghgprotocol.org). Before our emission figures are published, PricewaterhouseCoopers checks them to verify our calculations. Their complete assurance report for the whole Corporate Responsibility Report is included in the Independent assurance report.