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Taxation - Tax Charge (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
 [1]
Dec. 31, 2019
Corporation tax      
Current year £ 35.7 £ 187.4 £ 423.0
Prior years (1.7) (19.7) (63.4)
Corporation tax 34.0 167.7 359.6
Deferred tax      
Current year (6.7) (46.7) (78.3)
Prior years (3.3) (11.7) (6.3)
Deferred tax (10.0) (58.4) (84.6)
Tax charge [2] £ 24.0 £ 109.3 [3] £ 275.0
[1] Figures for the period ended 30 June 2019 figures have been re-presented in accordance with IFRS 5: Non-current Assets Held for Sale and Discontinued Operations, as described in note 13.
[2] Figures have been restated as described in the accounting policies.
[3] Figures for the period ended 30 June 2019 have been re-presented in accordance with IFRS 5: Non-current Assets Held for Sale and Discontinued Operations, as described in note 13.