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v3.24.0.1

Net debt - Reconciliation - Additional Information (Details) £ in Millions | 12 Months Ended
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Dec. 31, 2022 GBP (£) € / £ | Dec. 31, 2022 GBP (£) $ / £ | Dec. 31, 2022 GBP (£) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 GBP (£)
Net debt |  |  |  |  |
Foreign exchange gain (loss) on debt and derivatives |  |  | £ (74) | £ 30 |
Strengthening (weakening) of currency | 0.06 | 0.14 |  |  |
Cash paid on debt-related foreign exchange forward contracts |  |  | 4 | 19 |
Cash decrease (increase) for borrowings |  |  | (2,378) | 1,149 |
Proceeds from new debt |  |  | (2,383) | (5) | £ (1,690)
Decrease (increase) in overdraft |  |  | (865) | 972 |
Debt repayments |  |  | 844 | 167 | 1,352
Cash outflow from payment of interest on debt |  |  | 26 | 15 |
Amount of cash decrease (increase) for derivatives |  |  | (7) | 31 |
Cash outflow (inflow) on settlement of debt-related foreign exchange forward contracts |  |  | (26) | 19 | 24
Cash outflow from payment of interest on derivatives |  |  | 19 | 12 |
Cash outflow for leases |  |  | 114 | 94 |
Capital element of lease payments |  |  | 104 | 88 | 85
Interest element of lease payments |  |  | 10 | 6 | £ 7
Book value | £ 3,574 | £ 3,574 | 3,574 | 1,256 |
Bond Debt |  |  |  |  |
Net debt |  |  |  |  |
Book value | 2,987 | 2,987 | 2,987 | 1,254 |
Fair market value | £ 2,826 | £ 2,826 | £ 2,826 | £ 1,272 |

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