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Operating expenses by nature (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating expenses by nature      
Employee costs £ 2,506 £ 1,736 £ 1,405
Direct materials and services 900 704 586
Vehicle costs 285 201 146
Property costs 106 82 60
Depreciation and impairment of property, plant and equipment 154 140 128
Amortisation and impairment of intangible assets 201 140 91
One-off and adjusting items 98 136 21
Other operating expenses 461 234 173
Total operating expenses 4,711 3,373 2,610
Impairment losses related to property, plant and equipment £ 0 £ 8 £ 0