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Adjusted Cash Flow and Free Cash Flow (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Adjusted Cash Flow and Free Cash Flow      
Operating profit £ 317 £ 347 £ 294
Depreciation and impairment of property, plant and equipment 148 128 132
Depreciation and impairment of leased assets 106 78 78
Amortisation and impairment of intangible assets (excluding computer software) 118 74 82
Amortisation and impairment of computer software 22 17 19
Other noncash items 8 6 (1)
Inventories (4) (3) (23)
Contract costs (10) (5) (2)
Trade and other receivables 37 59 (19)
Accrued income (32)   2
Trade and other payables and provisions (75) (43) 78
Contract liabilities 81 11 13
Cash generated from operating activities 716 669 653
Purchase of property, plant and equipment (153) (128) (130)
Purchase of intangible fixed assets (37) (32) (23)
Capital element of lease payments and initial direct costs incurred (104) (88) (83)
Proceeds from sale of property, plant and equipment 5 7 6
Cash impact of one-off and adjusting items 59 27 7
Dividends received from associates 4 4 12
Adjusted Cash Flow 490 459 442
Interest received 13 5 8
Interest paid [1] (52) (42) (49)
Income tax paid (77) (69) (64)
Free Cash Flow £ 374 £ 353 £ 337
[1] Interest paid includes the interest element of lease payments of £10m (2021: £6m; 2020: £7m).