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Operating expenses by nature (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating expenses by nature      
Employee costs £ 1,736 £ 1,405 £ 1,305
Direct materials and services 704 586 583
Vehicle costs 201 146 134
Property costs 82 60 65
Depreciation and impairment of property, plant and equipment 140 128 132
Amortisation and impairment of intangible assets 140 91 101
One-off and adjusting items - operating 136 21 8
Other operating expenses 234 173 181
Total operating expenses £ 3,373 £ 2,610 £ 2,509