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Financial instruments - valuation - Valuation techniques (Details) - Level 3 | Dec. 31, 2024 | Dec. 31, 2024 GBP (£) | Dec. 31, 2023 | Dec. 31, 2023 GBP (£)
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Loans | Price | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.88 |  | 0.88 |
Loans | Price | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 1.23 |  | 1.23 |
Loans | Credit spreads | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.0036 |  | 0.0049 |
Loans | Credit spreads | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.0093 |  | 0.0119 |
Debt securities | Price | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 1.16 |  | 1.19 |
Equity shares | Price | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.15 | 47,312 | 0.30 | 32,142
Equity shares | Discount margin | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.09 |  | 0.07 |
Equity shares | Discount margin | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.13 |  | 0.09 |
Equity shares | Fund NAV | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.80 |  | 0.80 |
Equity shares | Fund NAV | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 1.20 |  | 1.20 |
Credit derivatives | Correlation | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | (0.15) |  | (0.15) |
Credit derivatives | Correlation | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.95 |  | 0.95 |
Credit derivatives | Credit spreads | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.0015 |  | 0.0013 |
Credit derivatives | Credit spreads | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.0086 |  | 0.0600 |
Credit derivatives | Volatility | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.30 |  | 0.30 |
Credit derivatives | Volatility | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.80 |  | 0.80 |
Credit derivatives | Upfront points | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.99 |  | 0.99 |
Credit derivatives | Recovery rate | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.60 |  | 0.60 |
Interest rate and FX derivatives | Correlation | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | (0.50) |  | (0.50) |
Interest rate and FX derivatives | Correlation | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.98 |  | 0.99 |
Interest rate and FX derivatives | Volatility | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.03 |  | 0.30 |
Interest rate and FX derivatives | Volatility | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.99 |  | 1.11 |
Interest rate and FX derivatives | Constant Prepayment Rate | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.02 |  | 0.02 |
Interest rate and FX derivatives | Constant Prepayment Rate | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.20 |  | 0.22 |
Interest rate and FX derivatives | Mean Reversal | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.20 |  | 0.20 |
Interest rate and FX derivatives | Inflation volatility | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.01 |  | 0.02 |
Interest rate and FX derivatives | Inflation volatility | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.02 |  | 0.02 |
Interest rate and FX derivatives | Inflation rate | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.02 |  | 0.02 |
Interest rate and FX derivatives | Inflation rate | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.02 |  | 0.03 |

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