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Taxation - Tax Charge (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
 [1]
Dec. 31, 2017
 [1]
Corporation tax      
Current year £ 423.0 £ 404.2 £ 383.0
Prior years (63.4) (108.1) (97.2)
Corporation tax 359.6 296.1 285.8
Deferred tax      
Current year (78.3) (41.5) (207.4)
Prior years (6.3) 1.4 4.6
Deferred tax (84.6) (40.1) (202.8)
Tax charge [2] £ 275.0 £ 256.0 [3] £ 83.0 [3]
[1] Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.
[2] Figures have been restated, as described in the accounting policies.
[3] Profit before taxation has been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.