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Costs of services and general and administrative costs - Summary of Operating Costs (Details) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Costs of services and general and administrative costs include:    
Staff costs £ 3,685 £ 3,985
Establishment costs 219 242
Media pass-through costs 1,279 1,208
Other costs of services and general and administrative costs 1,259 1,369
Costs of services and general and administrative costs 6,442 6,804
Employee benefits expense non headline staff 4 77
Other pass-through costs 358 420
Other costs of services and general and administrative costs include:    
Goodwill impairment 116 0
Amortisation and impairment of acquired intangible assets 32 57
Restructuring and transformation costs £ 32 £ 131