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Costs of services and general and administrative costs - Summary of Operating Costs (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Analysis of income and expense [abstract]      
Costs of services £ 12,290 £ 12,326 £ 11,890
General and administrative costs 1,126 1,988 1,181
Costs of services and general and administrative costs 13,416 14,314 13,071
Costs of services and general and administrative costs include:      
Staff costs (note 5) 7,761 8,137 8,166
Establishment costs 472 516 536
Media pass-through costs 2,523 2,174 1,906
Other costs of services and general and administrative costs 2,660 3,487 2,463
Other pass-through costs 859 811 724
Goodwill impairment (note 11) 237 63 38
Amortisation and impairment of acquired intangible assets 93 728 62
Other impairment charges 26 18 77
Restructuring and transformation costs 251 196 219
Property-related restructuring costs 26 232 18
(Gains)/losses on disposal of investments and subsidiaries (322) (7) 36
Legal provision charges/(gains) £ 68 £ (11) £ 0