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Adjusted Cash Flow and Free Cash Flow - Adjusted Free Cash Flow conversion (Details) - GBP (£) £ in Millions | 12 Months Ended
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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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