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Auditor's remuneration (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Auditor's remuneration.
Fees payable to the Company's auditor for the audit of the Parent Company and Group accounts	£ 3	£ 2	£ 1
Audit of accounts of subsidiaries of the Group	4	3	2
Audit-related assurance services	2
Total audit and audit-related assurance services	9	5	3
Non-audit services	3
Total	12	£ 5	£ 3
Amount paid to the Company's auditor in respect of the 2021 PCAOB group audit	£ 2

X

- Definition

The amount of fees paid or payable to the entity's auditors.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

+ Details

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Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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X

- Definition

The amount of fees paid to the entity's auditors in respect of the 2021 PCAOB group audit.

+ References

No definition available.

+ Details

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X

- Definition

The amount of fees paid or payable to the entity's auditors for audit services in assurance services.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The amount of fees paid or payable to the entity's auditors for audit services in subsidiaries.

+ References

No definition available.

+ Details

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- Definition

Fees payable to the Company's auditor for the audit of the Parent Company and Group accounts

+ References

No definition available.

+ Details

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X

- Definition

The amount of fees paid or payable to the non-audit services.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Represent to information related to Total audit and audit-related assurance services.

+ References

No definition available.

+ Details

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