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Income tax expense (Details) - GBP (£)
£ in Millions
 12 Months Ended
Apr. 01, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of geographical areas        
Adjustment in respect of previous periods   £ 2 £ (3) £ (3)
Total current tax   78 54 67
Deferred tax (credit)/expense   (3) 21 (17)
Deferred tax adjustment in respect of previous periods   (11) (13) (6)
Total deferred tax   (14) 8 (23)
Total income tax expense [1]   64 62 44
UK        
Disclosure of geographical areas        
Taxation   £ 17 £ 9 £ 9
UK corporation tax rate 25.00% 19.00% 19.00% 19.00%
Overseas countries        
Disclosure of geographical areas        
Taxation   £ 59 £ 48 £ 61
Total income tax expense   £ 58 £ 50 £ 40
[1] Taxation includes £58m (2021: £50m; 2020: £40m) in respect of overseas taxation.