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Other reserves - Translation Reserve Comprises (Details) - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Disclosure of reserves within equity [line items] |  |  |  |
Equity | £ 3,734 | £ 3,833 | £ 4,160 | £ 4,068
Translation reserve |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Equity | 148 | 229 | 526 | £ 227
Balance relating to continuing net investment hedges |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Equity | (86) | (53) | (144) |
Balance relating to discontinued net investment hedges |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Equity | (38) | (68) | (85) |
Balance related to foreign exchange differences on translation of foreign operations |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Equity | £ 272 | £ 350 | £ 755 |

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