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Operating expenses (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating expenses      
Employee costs £ 2,558 £ 2,550 £ 1,777
Direct materials and services 877 900 704
Vehicle costs 291 286 201
Property costs 107 108 82
Depreciation and impairment of property, plant and equipment 159 154 140
Amortisation and impairment of intangible assets 225 201 140
Other operating expenses 614 512 329
Total operating expenses £ 4,831 £ 4,711 £ 3,373