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Related parties (Details) - GBP (£) £ in Millions	1 Months Ended
	Feb. 28, 2023	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Related parties
Threshold value of eligible liabilities for UK authorized institutions to have to pay Bank of England levy			£ 600.0
Main Pension Scheme
Related parties
Transfer of amount to reservoir trust to meet potential future contributions	£ 471.0
Bank deposits held within entity		£ 43.2		£ 36.2
HM Treasury
Related parties
Proportion of ordinary shares in reporting entity held (in %)		9.99%		37.97%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

Bank deposits held within entity

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No definition available.

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- Definition

Proportion of ordinary shares in reporting entity held

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- Definition

Threshold value of eligible liabilities for UK authorized institutions to have to pay Bank of England levy.

+ References

No definition available.

+ Details

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- Definition

The transfer of amount to reservoir trust to meet potential future contributions.

+ References

No definition available.

+ Details

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- Details

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