Related parties (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Related party transactions
Cash ratio deposits		0.403%
Threshold eligible liabilities		£ 600.0
Forecast \| Main Scheme
Related party transactions
Transfer of amount to reservoir trust to meet potential future contributions	£ 471.0
HM Treasury
Related party transactions
Proportion of ordinary shares held		45.97%
Other interests
Related party transactions
Investments and other assets, related parties		£ 871.0
Liabilities		£ 4.5

The amounts payable resulting from related party transactions. [Refer: Related parties [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2022-03-24
-Paragraph 20
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_20&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2022-03-24
-Paragraph 18
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_18_b&doctype=Standard
-URIDate 2022-03-24

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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.

+ References

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- Definition

Cash ratio deposits (CRDs) are non-interest bearing deposits lodged with the bank of england by eligible institutions (ie. banks and building societies), who have reported average eligible liabilities (ELs) of over 600 million over a calculation period.

+ References

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- Definition

Investments and other assets, related parties

+ References

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- Definition

Proportion of ordinary shares held

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- Definition

The amount of threshold eligible liabilities to calculate non-interest bearing deposit used to determine the ratio deposit.

+ References

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- Definition

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

+ References

No definition available.

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