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Adjusted Cash Flow and Free Cash Flow - 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
Net cash from operating activities	£ 600	£ 563	£ 548
Purchase of property, plant, equipment and intangible fixed assets	(190)	(160)
Capital element of lease payments and initial direct costs incurred	(104)	(88)	(83)
Proceeds from sale of property, plant, equipment and software	5	7	6
Cash impact of one-off and adjusting items	59	27	7
Dividends received from associates	4	4	12
Free Cash Flow	£ 374	£ 353	£ 337

X

- Definition

The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities. [Refer: Revenue]

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- Definition

The cash inflow representing dividends received from associates, classified as investing activities. [Refer: Associates [member]; Dividends received]

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- Definition

The cash inflow from sales of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment]

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- Definition

Represents the cash impact of one-off and adjusting items.

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Amount of free cashflow from continuing operations.

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Payments for capital element of lease payments and initial direct costs incurred

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- Definition

The cash outflow for the purchase of property, plant and equipment, intangible assets.

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