1.15 US GAAP
The presentation of the Group's accounts can also be affected by changes to generally accepted accounting principles. US GAAP continues to be revised and subject to new interpretations. Such changes may influence the results reported and the valuation of the Group's shares. For guidance, independent external professional advice is available to management and the Audit Committee. The results of the Group are influenced by the application of US GAAP in areas involving significant subjectivity and judgement, such as pensions and share based payments.