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Operating expenses - Share-based payments (Details)
£ / shares in Units, £ in Millions, Option in Millions, EquityInstruments in Millions
 12 Months Ended
Dec. 31, 2023
GBP (£)
EquityInstruments
Option
£ / shares
Dec. 31, 2022
GBP (£)
EquityInstruments
Option
£ / shares
Dec. 31, 2021
GBP (£)
EquityInstruments
Option
£ / shares
Shares awarded      
Share-based payments, market price measurement period preceding grant date 5 days    
Maximum      
Shares awarded      
Share-based payments, volatility measurement period 5 years    
Sharesave      
Average exercise price      
At 1 January | £ / shares £ 1.63 £ 1.61 £ 1.64
Granted | £ / shares 1.42 1.86 1.80
Exercised | £ / shares 1.44 1.88 1.76
Cancelled | £ / shares 1.72 1.60 2.02
At 31 December | £ / shares £ 1.59 £ 1.63 £ 1.61
Shares under option      
At 1 January | Option 99.0 95.0 96.0
Granted | Option 43.0 25.0 24.0
Exercised | Option (23.0) (15.0) (10.0)
Cancelled | Option (5.0) (6.0) (15.0)
At 31 December | Option 114.0 99.0 95.0
Options exercisable, vesting period 6 months    
Options exercisable | Option 19.0 5.1 6.0
Weighted average share price | £ / shares £ 2.20 £ 2.59 £ 2.19
Weighted average remaining contractual life of outstanding share options 2 years 3 months 2 years 2 years 1 month 6 days
Fair value of of options granted during the period £ 27.3 £ 22.1 £ 17.0
Shares awarded      
Share-based payments, market price measurement period preceding grant date 3 days    
Sharesave | Minimum      
Shares under option      
Exercise price of outstanding share options | £ / shares £ 1.12 £ 1.12 £ 1.12
Sharesave | Maximum      
Shares under option      
Exercise price of outstanding share options | £ / shares £ 1.89 £ 2.27 £ 2.27
Deferred performance awards      
Shares under option      
Options exercisable, vesting period 3 years    
Value at grant      
At 1 January £ 93.0 £ 132.0 £ 169.0
Granted 52.0 46.0 61.0
Forfeited (2.0) (4.0) (10.0)
Vested (67.0) (81.0) (88.0)
At 31 December £ 76.0 £ 93.0 £ 132.0
Shares awarded      
At 1 January (in shares) | EquityInstruments 46 65 77
Granted (in shares) | EquityInstruments 20 20 32
Forfeited (in shares) | EquityInstruments (1) (2) (5)
Vested/exercised (in shares) | EquityInstruments (30) (37) (39)
At 31 December (in shares) | EquityInstruments 35 46 65
Long-term incentives      
Value at grant      
At 1 January £ 49.0 £ 44.0 £ 50.0
Granted 11.0 16.0 6.0
Vested (10.0) (10.0) (12.0)
Lapsed (1.0) (1.0)  
At 31 December £ 49.0 £ 49.0 £ 44.0
Shares awarded      
At 1 January (in shares) | EquityInstruments 23 21 24
Granted (in shares) | EquityInstruments 5 7 3
Vested/exercised (in shares) | EquityInstruments (4) (4) (6)
Lapsed (in shares) | EquityInstruments (1) (1)  
At 31 December (in shares) | EquityInstruments 23 23 21
Market value of awards vested and exercised £ 9.5 £ 11.7 £ 13.0