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Share capital and other equity (Details) £ / shares in Units, shares in Thousands, £ in Millions | Dec. 31, 2022 GBP (£) £ / shares shares | Dec. 31, 2022 $ / shares | Aug. 26, 2022 £ / shares | Aug. 25, 2022 £ / shares | Dec. 31, 2021 GBP (£) shares | Dec. 31, 2020 GBP (£)
--- | --- | --- | --- | --- | --- | ---
Share capital |  |  |  |  |  |
Value of shares | £ | £ 36,496.0 |  |  |  | £ 41,803.0 | £ 43,824.0
Ordinary shares |  |  |  |  |  |
Share capital |  |  |  |  |  |
Value of shares | £ | £ 10,539.0 |  |  |  | £ 11,468.0 | £ 12,129.0
Number of shares | shares | 9,786,024 |  |  |  | 11,467,982 |
Par value per share | £ / shares | £ 1.076923076923077 |  | £ 1.0769 | £ 1 |  |
Non-cumulative preference shares of US$0.01 |  |  |  |  |  |
Share capital |  |  |  |  |  |
Number of shares | shares |  |  |  |  | 10 |
Par value per share | $ / shares |  | $ 0.01 |  |  |  |
Cumulative preference shares of 1 |  |  |  |  |  |
Share capital |  |  |  |  |  |
Value of shares | £ | £ 0.5 |  |  |  | £ 0.5 |
Number of shares | shares | 483 |  |  |  | 483 |
Par value per share | £ / shares | £ 1 |  |  |  |  |

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