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 is included in the “Independent assurance report”.