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Unaudited Condensed Consolidated Interim Statement of Changes in Equity (Parenthetical) - GBP (£)
£ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Statement of changes in equity [abstract]      
Total comprehensive income for the period £ 360.8 £ 388.3 £ 978.6