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Notes 1-5

3. Currency conversion

The reporting currency of the Group is the pound sterling and the unaudited condensed consolidated interim financial statements have been prepared on this basis.

The 2011 unaudited condensed consolidated interim income statement is prepared using, among other currencies, average exchange rates of US$1.6158 to the pound (period ended 30 June 2010: US$1.5257; year ended 31 December 2010: US$1.5461) and €1.1525 to the pound (period ended 30 June 2010: €1.1505; year ended 31 December 2010: €1.1664). The unaudited condensed consolidated interim balance sheet as at 30 June 2011 has been prepared using the exchange rates on that day of US$1.6067 to the pound (30 June 2010: US$1.4963; 31 December 2010: US$1.5591) and €1.1071 to the pound (30 June 2010: €1.2206; 31 December 2010: €1.1665).

The basis for calculating the constant currency percentage changes, shown on the face of the unaudited condensed consolidated interim income statement, is described in the Glossary.