We use a number of financial and non-financial key performance indicators (KPIs) to review our performance and assess progress towards achieving our vision and strategic objectives. For further details on our performance and definitions, please refer to our 2018 Annual Report and Financial Statements (pages 32 and 33).

*The impairment charge for 2016 and 2017 is calculated in accordance with IAS 39. The impairment charge for 2018 is calculated in accordance with IFRS 9

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