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Adjusted Cash Flow and Free Cash Flow - Adjusted Free Cash Flow conversion (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Adjusted Cash Flow and Free Cash Flow
Adjusted profit after tax	£ 427	£ 336
Free Cash Flow	374	353	£ 337
Product development additions	10	7
Net investment hedge cash interest through Other Comprehensive Income	8	4
Adjusted Free Cash Flow	£ 392	£ 364
Adjusted Free Cash Flow conversion	91.80%	108.30%

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Percentage of adjusted free cash flow conversion calculated with adjusted profit loss after tax divided by adjusted free cash flow from continuing activities.

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Free cash flows from (used in) product development additions.

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Amount of free cashflow from continuing operations.

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Free cash flows from (used in) net investment hedge cash interest through other comprehensive income.

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