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Finance cost - Additional information (Details) £ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2020 GBP (£) | Dec. 31, 2022 GBP (£) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 USD ($) | Jul. 31, 2019 USD ($) | Feb. 28, 2019 USD ($)
Disclosure of detailed information about borrowings |  |  |  |  |  |  |
Interest expense on foreign exchange swaps including coupon interest |  | £ 26 | £ 17 |  |  |  |
Interest expense on foreign exchange swaps including coupon interest in other comprehensive income |  | £ 8 | £ 4 |  |  |  |
Fair value loss on other derivatives |  |  |  | £ 26 |  |  |
Synthetic Borrowing Unit |  |  |  |  |  |  |
Disclosure of detailed information about borrowings |  |  |  |  |  |  |
Notional amount | $ |  |  |  |  | $ 335 | $ 165 | $ 170
Investment interest rate | 1.90% |  |  |  |  |  |
Fair value loss on other derivatives | £ 26 |  |  |  |  |  |

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