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Post balance sheet events (Details) - GBP (£) £ in Millions, shares in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 15, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Consideration for shares repurchased |  | £ 2,416.0 | £ 2,054.0 | £ 1,806.0
Share repurchases |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Number of shares repurchased and cancelled | 64.6 |  |  |
Consideration for shares repurchased | £ 138.5 |  |  |

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