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Reconciliation of profit before taxation to headline operating profit (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure Of Reconciliation Of Profit Before Interest And Taxation To Headline PBIT [Abstract]  
Summary of Reconciliation of Operating (Loss)/Profit to Headline Operating Profit
Reconciliation of profit before taxation to headline operating profit:
202420232022
£m£m£m
Profit before taxation
1,031 346 1,160 
Finance and investment income(137)(127)(145)
Finance costs417 389 359 
Revaluation and retranslation of financial instruments
50 (7)(76)
Profit before interest and taxation
1,361 601 1,298 
(Earnings)/loss from associates
(36)(70)60 
Operating profit1,325 531 1,358 
Goodwill impairment237 63 38 
Amortisation and impairment of acquired intangible assets93 728 62 
Other impairment charges
26 18 77 
Restructuring and transformation costs251 196 219 
Property-related restructuring costs
26 232 18 
(Gains)/losses on disposal of investments and subsidiaries
(322)(7)36 
Gain on disposal of property
(7)— — 
Other transaction costs
10 — — 
Gains on remeasurement of equity interests arising from a change in scope of ownership— — (66)
Legal provision charges/(gains)
68 (11)— 
Headline operating profit1,707 1,750 1,742