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Non-controlling interests (Tables)
 6 Months Ended
Jun. 30, 2019
Non-controlling interests [abstract]  
Non-controlling interests
Profit attributable to non-controlling interestsEquity attributable to non-controlling interests
Half year endedHalf year endedAs atAs at
30.06.1930.06.1830.06.1931.12.18
£m £m £m £m
Other non-controlling interests-(1)22