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Other investments (Details) - GBP (£) £ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Other investments |  |
Weighted average effective interest rate | 0.00% | 0.40%
Other investments | £ 24 | £ 2
Current portion | 1 | 2
Non-current portion | 23 |
Financial assets either past due or impaired | 0 | 0
Pound |  |
Other investments |  |
Other investments | 1 | 2
Other currencies |  |
Other investments |  |
Other investments | 23 |
Six months to one year | Fixed |  |
Other investments |  |
Other investments | £ 1 | £ 2

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