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Contingent liabilities and legal proceedings - Continuing matters relating to Dr Vijay Mallya and affiliales (Details) £ in Millions, $ in Millions |  |  |  | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 23, 2019 USD ($) | May 23, 2019 GBP (£) | Nov. 16, 2017 USD ($) instalment | Nov. 16, 2017 GBP (£) instalment | Feb. 25, 2016 USD ($) instalment | Feb. 25, 2016 GBP (£) instalment | Jun. 30, 2023 | Dec. 31, 2021 | Feb. 25, 2016 GBP (£)
25 February agreement |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Number of instalments |  |  |  |  | 5 | 5 |  |  |
Dr Mallya | 25 February agreement |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Payment relating to disengagement agreements |  |  |  |  | $ 75 | £ 60 |  |  |
Consideration payment period |  |  |  |  | 5 years | 5 years |  | 5 years |
Payment relating to disengagement agreements |  |  |  |  | $ 40 | £ 32 |  |  |
Amount payable in equal installments to Dr Mallya |  |  |  |  | 7 |  |  |  | £ 6
Number of disputed instalments |  |  | 2 | 2 |  |  |  |  |
Watson Limited |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Damages awarded | $ 135 | £ 107 |  |  |  |  |  |  |
Watson Limited | 25 February agreement |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Release of obligations to indemnify under guarantee of certain borrowings |  |  |  |  | $ 141 | £ 112 |  |  |
Damages related to breach of associated security documents |  |  | $ 142 | £ 113 |  |  |  |  |
Continental Administration Services Limited (CASL) |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Damages awarded, co-surety percentage |  |  |  |  |  |  | 50.00% |  |

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